Age is just a number. You might strike up a conversation with someone after a cycling class and be shocked to find out that they’re a full two decades older than you. We’re all aging but our pace and performance as we age is highly variable. But scientists now understand more about why we age and how the choices we make can prove that age is just a number.
Knowing the key "nine hallmarks of aging" is crucial in figuring out how to optimize your lifestyle in a way that can add quality years to your life and optimize your day-to-day. Below, a doctor explains the science.