Adding years to life and adding healthy years to life are different achievements, and longevity science increasingly treats them that way. The first is measured by lifespan. The second is measured by healthspan, the years a person spends in good health.
Marc Kielburger, the Canadian author whose work is dedicated to helping people live fulfilled lives, has made that lifespan vs. healthspan distinction central to how he talks about aging well. He also steers the conversation toward a factor that gets less attention than diet or exercise: purpose. In Kielburger's view, meaning and human connection belong alongside sleep, movement, and nutrition, because they help keep people active and engaged as they age.
