• Kayla Barnes-Lentz spends all day optimizing her health to try to live to 150.
• She also runs her own business, so has to fit her biohacking around her busy workday.
• She has a 2.5 hour-long morning routine, takes regular biohacking breaks, and goes to bed by 8:30 pm.

From the second Kayla Barnes-Lentz wakes up, her day is built around enhancing her health.

Barnes-Lentz, 33, told Business Insider that her extensive biohacking routine has helped her to reverse her biological age by 11 years. Biological age is a measure of how healthy a person's cells and organs are, but scientists don't agree on the definition.

As a co-owner of a longevity clinic in Cleveland and the host of a podcast about health optimization, she counts this routine as part of her work.

"During work, I have my office optimized for optimal productivity, and I incorporate health optimization practices throughout the day," she said.

Barnes-Lentz's habits aren't all scientifically proven. But she and other biohackers, such as the millionaire entrepreneur Bryan Johnson, take a chance on experimental treatments to live as long as possible. Barnes-Lentz wants to reach 150, while Johnson's mantra is "don't die."

She's inspired by naturopathic medicine, which is based on folk healing methods rather than evidence-based medicine. Barnes-Lentz and the medical team at her clinic use scientific literature to "guide" what she describes as her "health protocols." She said she has also hired female PhD candidates to "dive into the literature" around women's health and longevity to inform her female-focused protocols, which she sells.

For the average person, experts say that getting the basics right can make a big difference to longevity. For example, a study published last year found that a healthy diet can increase lifespan by up to 10 years, and Nathan K. LeBrasseur, a physiologist at Mayo Clinic, previously told BI that spending just 3% of your day exercising can contribute to healthy aging.

Barnes-Lentz shared how she fits biohacking around running her business.

Before work, she spends 2.5 hours biohacking

Barnes-Lentz's morning routine is 2.5 hours long. She starts with what she describes as an "oral protocol," which includes tongue scraping, water flossing, and oil pulling. Tongue scraping and flossing are commonly recognized as effective ways to reduce bacteria and plaque in the mouth. But there's not enough evidence that oil pulling, an Ayurvedic practice that involves swishing oil around the mouth, is good enough for oral health to be recommended by the American Dental Association.

She also does her first round of pulsed electromagnetic field therapy, a noninvasive treatment in which bursts of electric currents are sent through soft tissue across the body.

"I think of our body as a battery, and PEMF can increase your charge," she said.

Evidence suggests that PEMF could be useful in treating osteoarthritis and bone fractures, but more evidence is needed to confirm this, according to the authors of a 2023 review of research published in the International Journal of Molecular Sciences.

Barnes-Lentz also works out, gets some sun exposure to regulate her circadian rhythm, spends time in a sauna, showers, and measures her biometrics (body composition, grip strength, lung health, and blood pressure) before breakfast.

She does red light therapy while working

Barnes-Lentz works from 7:30 a.m. to 5 p.m. most days, running her longevity business, podcast, and social media accounts, including her Instagram account, which has 383,000 followers. She tries to do 10,000 steps a day and move her body as much as possible.

To do so, she takes calls while walking and takes breaks every 90 minutes to walk or do what she considers a biohack, such as standing on a whole body vibration plate.

Even when she does desk-based work, she said she's biohacking. This involves sitting on a "biohacking desk chair," which encourages good posture, and wearing a red light therapy cap to help her hair grow faster and thicker. Red light therapy has been found to help with hair regrowth and increasing thickness and length in some large randomized trials, according to the American Academy of Dermatology.

In her office, she has an air filtration system and uses natural light instead of LEDs to avoid interrupting her circadian rhythm. In a 2023 research report published in the journal Frontiers in Photonics, experts agreed that blue light from LEDs can disrupt sleep when people are repetitively exposed to it for prolonged periods at night.

Barnes-Lentz also inhales humid air using a NanoVi machine —which is advertised as a means to repair proteins in the body damaged by oxidative stress — to improve her cognition and brain health. Research suggests that oxidative stress, which is caused by factors including sunlight, alcohol, and certain medications, plays a role in aging and the development of neurodegenerative diseases.

A small 2022 study suggested that it could help improve cellular health and cognition in older people. Published in the International Journal of Molecular Science, it involved four people with cognitive impairment who used a NanoVi over 12 weeks. However, more research is needed.

A cold plunge at lunchtime

"My mid-day routine consists of a whole body vibration plate and cold plunge, which gives me a natural increase in energy, followed by a hyperbaric chamber session," Barnes-Lentz said.

She does five hourlong sessions in a hyperbaric chamber each week, using the time to catch up on messages on her phone. Hyperbaric oxygen chambers contain a pure, pressurize form of the gas to increase its absorption in the body. They are used to treat conditions including burns, wounds, skin and bone infections, and hearing and vision loss. Small studies have found that they might have anti-aging benefits too, although the FDA hasn't approved them for this use.

After work, she goes for a walk and optimizes her sleep schedule

Barnes-Lentz and her husband eat dinner at around 5 p.m., more than three hours before they go to bed at 8:30 p.m., to help them sleep.

She knows that a varied diet is good for the gut microbiome, so has different organic, seasonal vegetables and fruits delivered each week. The structure of her meals is always the same: vegetables, high-quality proteins, healthy fats, and carbohydrates that don't spike her blood sugar too much a few times a week, she said.

After dinner, the couple walks for 50 minutes in the hills around their LA home to aid digestion, catch up on their days, and get in more zone two cardio.

"Then, we begin our wind-down routine, which may involve more PEMF or relaxing together. At sunset, we ensure that the house is only red light to promote the release of melatonin," she said.

Some studies have found that using artificial red light at night can improve sleep quality, but a 2023 study published in the journal Frontiers in Psychiatry found no evidence that red light increases melatonin secretion and, in some cases, can increase alertness.

"I've worked really hard to build the life that I have. I'm incredibly blessed and very fortunate that I get to move my body and get to do all these things. And I'm excited to see what that's going to lead to in the future," Barnes-Lentz said.

• The world's oldest man, John Tinniswood, has died aged 112.
• Tinniswood had three pieces of life advice for younger people.
• They were: have a broad outlook, do everything in moderation, and always try your best.

In the UK in 1912, the Suffragettes were vandalizing post boxes to win women the right to vote and the Titanic was registered in the port city of Liverpool before its maiden, and only, voyage. Also registered in Liverpool that year was the birth of John Tinniswood.

Tinniswood, who was born on August 26, 1912, died on Monday at the age of 112, at his care home in Southport, UK.

Guinness World Records declared him the world's oldest man earlier this year, after the previous titleholder, Juan Vicente Pérez, from Venezuela, died at the age of 114 and 311 days.

The title could now fall to João Marinho Neto, a 112-year-old Brazilian, but his age hasn't yet been validated by Guinness World Records.

Tinniswood was also the world's oldest surviving male World War II veteran. He served in an admin role for the British Army Pay Corps, which involved logistical work including organizing food supplies and locating stranded soldiers. He then worked in admin and accountancy for the Royal Mail, the UK's postal service, as well as Shell and BP before he retired in 1972.

Tinniswood was married to his wife, Blodwen Tinniswood, for 44 years before she died in 1986. The couple had one child, four grandchildren, and three great-grandchildren.

The staff at his residential home described Tinniswood as a "big chatterbox," per Guinness World Records. At 111 years old, he was mobile and independent, managing his own finances and getting out of bed unassisted.

When he earned the title of oldest living man, Tinniswood was unphazed, telling Guinness World Records it "doesn't make any difference to me at all. I accept it for what it is."

Tinniswood had 3 pieces of life advice for younger people

Tinniswood's biggest piece of advice for people wanting to live as long as him was to do everything in moderation.

"If you drink too much, or you eat too much, or you walk too much, if you do too much of anything, you're going to suffer eventually," he said. "Never over-tax your system" if you want a healthy life, he told BBC News.

He didn't follow a specific diet, telling Guinness World Records, "I eat what they give me, and so does everybody else" — apart from fish and chips, a British classic, for dinner every Friday.

He didn't smoke and rarely drank alcohol, two habits that are great for longevity.

In 2022, he told BBC News that it's also important to "broaden your vision."

"Don't stay with one thing all the time or you'll be on a narrow path," he said.

But no matter what you're doing, "always do the best you can, whether you're learning something or whether you're teaching someone," he told Guinness World Records. "Give it all you've got. Otherwise, it's not worth bothering with."

This echoes research linking longevity to a positive mindset and a sense of purpose.

Ultimately, though, Tinniswood thought he mostly reached his old age out of "pure luck."

"You either live long or you live short, and you can't do much about it," he said.

Business Insider previously reported on Naomi Whitehead — the oldest person in the US — and her longevity tips.

• D'yan Forest is a working comedian at 90, doing gigs in two languages.
• She shared some of her tips for staying fit and funny into her 90s.
• These include having a positive outlook and spending time with younger friends.

It's never too late for a career change — even if you're almost 70.

After a 40-year-long career as a cabaret singer, D'yan Forest, who lives in New York City, became a comedian in 2001. Now 90, she holds the Guinness World Record for Oldest Female Comedian and still performs solo shows in English and French.

"I never thought I'd be a comedian at 90," she told Business Insider. "I make fun of myself and older ladies, and I sing parodies. I'm a little risqué, and the people love it because they can't believe that an older woman still has verve and fun and can say such risqué things."

Forest shared her longevity secrets for maintaining that verve into her 90s.

Keep your mind active

"Being funny keeps my mind working. I change my material every six months, so I'm always learning new things as the culture changes in France or America. What is amazing is that I'm getting better and better every time I perform," she said.

Doing comedy has also helped her look at life with a "fun slant," she said. "It's a mental outlook that keeps me going.

This chimes with what experts have previously told BI: Heidi Tissenbaum, a cancer biology professor who researches healthy lifespans, said that keeping the mind busy is one of the basics of longevity. The authors of a 2023 study on common traits of healthy centenarians recommended staying intellectually active and focusing on the good in life.

Exercise

Forest goes swimming every other day and plays golf three times a week.

"I go out for long weekends, and boy, after the third day, I'm exhausted," she said. "But that keeps me physically active. Not many women my age can walk the golf course like that."

A 2019 study by researchers at the National Cancer Institute found that adults who exercised consistently into later life had up to a 36% lower risk of dying from any cause over the 20-year follow-up period. The study also found that even starting to exercise in later life is beneficial for longevity.

Eat fresh whole foods

"I just eat pure food, raw vegetables and fruits. I don't like it when food is all artificial. My mother always said during the war, "Eat the fresh fish. Eat the fresh fruit." She wouldn't even cook 'em, just ate them," Forest said.

A 2023 study published in the journal Nutrients on 2,454 participants from China found that eating more fruit and vegetables lowered the risks of cognitive impairment in older age. A 2020 study published in the American Journal of Clinical Nutrition found that US women over 60 who ate more fruit and vegetables were less likely to experience fatigue, poor strength, and illnesses.

Have (lots of) younger friends

Forest goes out for dinner with a different friend every day of the week.

Having a strong community is important for longevity. It may be more important than a healthy diet and regular exercise, said Professor Rose Anne Kenny, chair of medical gerontology at Trinity College Dublin.

"The problem is, when you're 90, that a lot of your friends and family die," Forest said. "And that's why the comedy is good because through that I've met a lot of younger friends who have the same interests that I do."

She's not alone — 102-year-old Janet Gibbs also credits her longevity to having younger friends as well.