The decline in physical capabilities due to aging is often underestimated, requiring individuals to maintain a higher level of fitness than they might initially think to achieve their desired outcomes in later life.

“So the gravity of aging is more vicious than people realize, and therefore the height of your glider needs to be much higher than you think it is when you're our age, if you want to be able to do the things we probably want to be able to do when we're 90.”