Caroline Stanbury Talks Longevity and the ‘Holy Grail’ of Anti-Aging on ‘Uncut and Uncensored’

At 39, Leslie Kenny was told she might not live another five years. Diagnosed with lupus, rheumatoid arthritis, and Hashimoto’s disease, her body was functioning more like someone decades older. Today, Kenny says her biological age is 21. How did she reverse her biological clock by nearly four decades? The answer lies in cutting-edge longevity science that’s finally becoming accessible to everyone.

Caroline Stanbury has never shied away from reinvention, and on Uncut and Uncensored, she’s diving straight into one of her favorite topics: longevity. Sitting down with Kenny, an Oxford-based health entrepreneur and longevity expert, they tackle what it really means to age well, covering everything from cutting-edge science like autophagy and spermidine to the everyday realities of menopause, hormones, and energy levels.

How spermidine helps clean and renew the body

One of the biggest takeaways from Stanbury’s conversation with Kenny was the introduction of spermidine, a compound found in plants and naturally produced in the body when we’re younger. Kenny explained that spermidine activates a process called autophagy—essentially a deep cellular cleanup that clears out damaged parts and allows cells to renew themselves. “It’s really like Marie Kondo for your cells,” she says. “It comes in with a magic wand and garbage bag and basically declutters all the rubbish, and it turns the old back into new again.”

This process, which won a Japanese scientist the Nobel Prize in 2016, is considered one of the most important discoveries in anti-aging research. According to Kenny, spermidine doesn’t just support cell renewal—it also impacts nine out of 12 biological pathways that scientists have identified as drivers of aging. That’s why it’s been nicknamed the “Swiss Army knife for longevity.” 

The visual benefits of cellular renewal

While much of the science behind longevity happens at the cellular level, Kenny emphasizes that the results also show up where people often care the most—appearance. She explains that spermidine supports areas with rapid cell turnover, including hair, skin, and nails. “Spermidine can do that because it pushes hair follicles back into the growth phase of the hair life cycle,” she says. 

Kenny points out that as people move through menopause, hair growth phases shorten, often leaving women unable to grow their hair past their shoulders or leading to increased shedding. By helping extend the growth phase, spermidine may counteract that process. She also highlights its potential for improving skin texture and nail strength, since both rely on healthy, continually renewing cells.

Reverse the clock

Kenny’s expertise isn’t just theoretical—she shares her own remarkable transformation as proof of what longevity science can achieve.  Through lifestyle changes and an emphasis on cellular health, she dramatically shifted the trajectory of her life.

Today, she says her biological age is far younger than her actual years. “My biological age is 21, according to glycan age, and that is looking at the levels of inflammation in my body,” Kenny reveals. By putting her autoimmune conditions into remission and focusing on interventions like spermidine, she reversed her biological clock by nearly four decades.

It’s never too late to start

Stanbury addressed the fear many people have about seeking medical testing or starting new health routines later in life. She acknowledges how intimidating it can feel to face the possibility of discovering problems but stresses action over avoidance. She stresses the importance of getting tested even when you’re scared of what you might find. “Let me tell you, they can reverse a lot of things,” she says.

Stanbury shares that she once dreaded getting an MRI, expecting years of partying and family history of illness to reveal bad news. Instead, she was told she was in “perfect shape” and likely to outlive everyone she knew. That experience changed her perspective: Waiting until midlife to prioritize health doesn’t mean it’s too late. Choices like giving up smoking or drinking, removing toxic people from your life, and embracing wellness practices can still make a dramatic difference.

It’s never a one-size-fits-all approach

Kenny emphasizes that longevity strategies have to be tailored to the individual. What works for one person may not be the best path for another, especially as women approach menopause and their bodies respond differently to stress, hormones, and nutrition. “Every one of us is bio-individual,” she explains. “Test, don’t guess.”

She encourages listeners to establish a personal health baseline through functional medicine testing rather than following generalized wellness trends. For some, the biggest issue may be low iron or thyroid dysfunction; for others, inflammation or hormone imbalances might be the real obstacle. Without proper testing, it’s impossible to know where to focus.

Stanbury echoes this, noting how easy it is to be overwhelmed by the countless supplements and treatments promoted online. Instead of copying what friends, celebrities, or partners are doing, the smarter approach is to invest in personalized care. By identifying unique strengths and weaknesses, women can create a health plan that supports not just longevity but also day-to-day energy, confidence, and quality of life.