I think most people when they're young get ideas like strong, quick, resilient, sharp, pretty, handsome, flexible, healthy, and slim attached to their identities. Maybe not all of those, but a good number. As you age, you lose part of your identity, because these qualities you took for granted as yours - even if you tried not to - begin to vanish.

It's difficult to reconcile what you are with what you were. If you are lucky, you haven't taken these things too much for granted, and you have taken care of yourself and others well, and you have advanced in many areas, which offsets the losses.