What if your age wasn’t just a number—but a signal? In this fascinating look at longevity science, Aladdin H. Shadyab, Ph.D., invites us to rethink what it really means to grow older. While we often focus on chronological age—the number of years we’ve lived—Shadyab highlights something far more revealing: biological age. This measure reflects how quickly your body is actually aging, and it can vary widely from person to person, even among those born in the same year.
Shadyab explains that aging is not a one-size-fits-all process. Some individuals maintain strong physical and cognitive function well into later life, while others experience earlier decline. This “heterogeneity of aging” underscores the importance of looking deeper than the calendar. New scientific tools, particularly blood-based biomarkers, are helping researchers estimate biological age and even assess how different systems in the body—like the brain or immune system—are aging independently.
One of the most compelling aspects of this research is its connection to Alzheimer’s disease and other age-related conditions. Faster biological aging has been linked to increased risk of cognitive decline, suggesting that these blood-based measures could serve as early warning signs. Instead of waiting for symptoms to appear, scientists may be able to detect subtle changes much earlier, opening the door to more proactive and personalized approaches to prevention.
Encouragingly, this work also points to actionable steps. Shadyab discusses emerging evidence around lifestyle choices and treatments that may help slow biological aging and support long-term brain health. While the science continues to evolve, the message is clear: how we live today can influence how we age tomorrow. By understanding and potentially slowing our biological clock, we move closer to a future where healthier aging—and even Alzheimer’s prevention—becomes an achievable goal for more people.
Watch Slowing the Clock: Longevity Science Meets Alzheimer’s Prevention.
For more programs from the Sam and Rose Stein Institute for Research on Aging, visit uctv.tv/stein.