She's 35 and obsessed with living longer. It might be working.

AUSTIN — The overhead lights and lamps in the home switch from bright yellow to a soft orange. Custom-made furniture sits in every room, free of volatile organic compounds, or VOCs. Elsewhere, there's a hyperbaric chamber, PEMF machines, saunas with built-in red light therapy, a home gym and a cold plunge pool. Air purifiers protect the home's occupants from any toxicity that dare enter from outside. Say what you will about longevity entrepreneur Kayla Barnes-Lentz: The woman is meticulous.

The 35-year-old has built a cult following as the most publicly measured woman in the world, and the first woman to undergo ovarian biological age testing. Her ovaries are 30, not 35, thank you very much.

Barnes-Lentz opted to study nutrition in college after subsisting on a diet of Pop-Tarts and Toaster Strudel. She never graduated, but that didn't stop her from learning everything she could about how to live a healthy lifestyle, including earning certifications and growing businesses, Barnes-Lentz says. She opened clinic LYV in Ohio in 2018 (which she left in 2025), aiming to improve her health metrics in the process. Research doesn't necessarily support all the things she is doing and some experts worry her large following could be misled by the data she shares broadly. 

Barnes-Lentz outfitted LYV with a medical team that worked to offer patients a deeper look at their health than a typical doctor's visit. Gut tests, advanced thyroid panel, total toxins tests. She was the clinic's first patient. And she started posting the results publicly in 2019.

"I said, 'hey guys, why don't we develop the most science-backed protocol for longevity?' How healthy can we make me, essentially, is what I was thinking," she says.

She discovered some early differences that separated her personal data from previous research done on men. Caloric restriction, for example, upset her menstruation.

"My cycle became dysregulated for the first time," she says, and "my thyroid just started to decline. They were going to put me on a thyroid medication. And I took a step back and like, 'okay, hold on, this doesn't seem right.'"

Barnes-Lentz's experience isn't exactly a surprise. Two-thirds of dementia and Alzheimer's cases are in women, for example, but they are not represented proportionally in research. Women were only required to be included in clinical studies as of 1993, not to mention that only 1% of all federal funding goes to woman-specific research outside of cancer. It's the Wild West for women's health and longevity, and Barnes-Lentz is taking the reins.

'We live in an exciting time'

To read Barnes-Lentz's protocol in full is akin to attempting to read the dictionary from A to Z in one sitting. You will not retain anything trying to take in everything. But you can certainly pick and choose elements to focus on: what scans she recommends, what supplements and prescriptions she's taking and an overall look at her daily routine.

Peruse too quickly and you might miss the key medical disclaimer: "This website, including any experimental results presented, is for informational purposes only and does not constitute medical advice or professional services," it reads. "The information provided should not be used for diagnosing or treating a health problem or disease. Individuals seeking medical advice should consult with a licensed physician." Other longevity practitioners, like Bryan Johnson, list similar messages on their sites. She also stresses that she prioritizes the foundations of sleep, exercise, stress management, nutrition and connection over her many devices.

A snapshot of her protocol: She wakes up every day naturally at 5 a.m. and takes body composition measurements, followed by a workout and schvitz in the sauna with red light therapy. Breakfast follows that; she rotates what she eats but it always includes fermented foods, protein, greens and a Greek or coconut yogurt bowl. Her plate may feature eggs or salmon, and her greens, arugula or spinach. She mixes in collagen peptides and myriad seeds for fiber in her yogurt bowl; she strives for a hefty 40 grams of fiber per day, and 60 grams of protein just at breakfast.

Midday, after she's started working, she goes for a walk, wears her red light laser cap and spends an hour in her hyperbaric oxygen chamber. She begins cooking an organic dinner around 2 or 2:30 p.m., eats at 3 p.m. and is in bed by 8 p.m. after her evening supplements (she has a whole room devoted to her supplements in her home, though she emphasizes she does not take them all). Her stomach hardly growls, though if it gurgles in the evening hours she'll drink still or sparkling water.

Barnes-Lentz posts her results in full but that doesn't mean every woman's results will mirror hers. She credits her longevity efforts – she and her husband, Warren Lentz, have spent hundreds of thousands of dollars on their equipment – with lowering her ovarian age, which she tested with Timeless Biotech, a company she advises.

How does that ovarian age test work? "It's taking some standard biomarkers that we've had access to, but now there's this machine learning capability," she says. These biomarkers include follicle-stimulating hormone (FSH) and estrogen levels, along with lean mass, height and weight and when you started your first menstrual cycle.

Research has yet to confirm that lowering one's biological age, of any organ, means someone will live longer. But the data means Barnes-Lentz can look at interventions to improve her health. She can't pinpoint the exact reason her ovarian age is so low, but "now that I have that baseline, I'm only implementing one additional intervention (hyperbaric oxygen therapy) outside of basic lifestyle," she says, so when she re-tests next month, she may get a sense of how it affected her body. Barnes-Lentz and her husband want children someday.

But what does this information tell us, exactly? "Her followers see 'ovaries five years younger' as a result of her protocol – and that causal inference is completely unwarranted from the data," says Dr. Eric Verdin, the president and chief executive officer of the Buck Institute for Research on Aging. "The science of ovarian aging deserves serious research investment. What it doesn't benefit from is anecdote laundered as evidence by a large platform."

That said, "us physicians who are busy working may not be able to do that amazing job that she's doing into bringing preventative medicine to the spotlight," says her friend Dr. Poonam Desai, an osteopathic physician double-boarded in lifestyle and emergency medicine, "and really opening up conversations, making people think like, 'Oh, should I be thinking about how well my ovaries are aging,' especially when the fertility conversation is so big and loud out there."

'This stuff is very normal for me to talk about'

Barnes-Lentz has built up a cohort of medical doctors, dietitians and other providers who help inform her protocol, and consults specific doctors for specialized therapies, like hyperbaric oxygen therapy, peptides and therapeutic plasma exchange.

She makes money off affiliate links on her website, and charges $19 per month for private membership where her followers can ask her more direct questions about the protocol. But she's not the revenue generator in her family.

She and her husband co-own sauna company Heavenly Heat Saunas. Before their first date, she asked him to complete a myriad of tests as well as a biomarker screening.

"If a man is going to do a stool sample for you, he's in it for the long run," she joked during a panel conversation at SXSW in March. They had their first date in a multi-person hyperbaric chamber. She clarified: You sure you want to enter? Once it pressurizes, they'd be stuck for a bit. He was down, and four months later, they married in 2023. She wants to live as long as him, hopefully well into their 100s and in great health.

In the home they share, the testing never stops. Gadgets pour out of cabinets. A device on their toilet photographs of every stool and urine deposit. "By the way, this stuff is very normal for me to talk about," she adds.

Many ask Barnes-Lentz if she's enjoying her life or having fun. She must be so miserable, they think. But she says she's not.

"Who decided that fun equals staying out until 3 in the morning?" she wondered during the panel. "Who decided that alcohol is the only way to celebrate? Who decided these things?"