The pursuit of longevity has grow a modern obsession, fueled by a booming industry of supplements, rigorous exercise routines, intermittent fasting, and genetic testing—all promising to unlock the secrets to a longer life. But what if the key isn’t about defeating death, but rather about redefining our approach to aging itself? That’s the provocative idea being put forward by Dr. Felipe Sierra, a Chilean-born molecular biologist and a pioneer in the field of geroscience. He argues that the focus should shift from trying to live forever to maximizing healthspan—the years lived in fine health—and accepting that aging isn’t a disease to be cured, but a fundamental biological process.
Sierra, who previously directed the Division of Aging Biology at the National Institute on Aging (NIA) and now works with the Hevolution Foundation, a non-profit organization funding longevity research, challenges conventional wisdom. He suggests that the idea of “beating” aging is unrealistic. His perspective, recently shared in an interview with La Vanguardia, is gaining traction as scientists grapple with the complexities of the aging process. The core message: we should aim to live better for longer, understanding that aging is the biggest risk factor for nearly all diseases.
The Limits of Lifestyle and the Role of Chance
A common refrain in popular discussions about longevity is that lifestyle accounts for 70% of how we age, with genetics making up the remaining 30%. Sierra disputes this figure. He believes the genetic component is likely between 20% and 30%, and potentially even less. While healthy habits—a balanced diet and regular exercise—are undoubtedly beneficial, their impact on lifespan is modest, potentially adding around a year of life on average. The real benefit, he emphasizes, lies in the quality of those years: increased resilience, reduced disease risk, and greater independence. This aligns with growing research showing that maintaining physical and cognitive function is crucial for a fulfilling later life.
So, what accounts for the rest? According to Sierra, it’s largely down to chance. “We don’t die of old age, we die of diseases,” he explains. Genetics plays a more significant role in determining which diseases we develop than in determining how long we live. This introduces an element of unpredictability, a “biological lottery” that undermines any promise of absolute control over our lifespan. This inherent randomness also casts doubt on the reliability of genetic tests that claim to predict disease risk, as they often fail to account for protective factors and individual resilience.
Gerosciece: Aging as a Risk Factor, Not a Disease
The field of geroscience, which Sierra helped to establish, operates on a simple premise: age is a more significant clinical marker than almost any other. Studies have shown that being 75 years old carries a greater risk of cardiovascular disease than having high cholesterol, diabetes, and hypertension simultaneously. Similarly, in cancer, the body’s ability to defend against malignant cells weakens with age, allowing tumors to develop. This understanding shifts the focus from treating individual diseases to addressing the underlying biological processes of aging itself.
Sierra cautions against labeling aging as a disease, arguing that it’s a natural biological process, akin to menopause. However, he acknowledges that intervening in the mechanisms that drive aging is a valid area of research. Drugs like rapamycin and metformin have shown promise in animal studies, improving health and, in some cases, extending lifespan. However, he stresses that evidence in humans remains insufficient, and long-term studies are expensive, complex, and often unattractive to the pharmaceutical industry. He also expresses concern about the overreliance on computational models that lack a solid biological foundation, warning that the gap between basic science and financial logic can create unrealistic expectations.
A “Fourth Age” and the Future of Society
Beyond the biological aspects, Sierra points to a notable trend: people aged 65 and 70 today generally possess better physical and cognitive abilities than their parents did at the same age. This improvement in what he calls “intrinsic capacities,” driven by better living conditions, necessitates a rethinking of societal structures. Maintaining long retirements in societies where people are living into their 90s and beyond presents economic and cultural challenges.
Sierra proposes envisioning an active “fourth age,” with opportunities for continued learning and alternative forms of function. He believes we need to move beyond the traditional concept of retirement and create pathways for older adults to remain engaged and contribute to society. Personally, after decades of studying aging, Sierra offers a simple philosophy: it’s better to grow old than not to grow old at all. The key, he emphasizes, isn’t simply adding years to life, but preserving a sense of purpose and continuing to do what brings meaning to one’s life. As populations worldwide continue to age, understanding and adapting to these shifts will be crucial for building sustainable and equitable societies. The next major discussion point will likely center around funding for continued research into age-related diseases and the development of interventions to improve healthspan, as highlighted by the Hevolution Foundation’s ongoing investments in the field of longevity.
Disclaimer: This article provides information for general knowledge and informational purposes only, and does not constitute medical advice. It’s essential to consult with a qualified healthcare professional for any health concerns or before making any decisions related to your health or treatment.
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