When did you realize you were old and not immortal, and how did you deal with it?

I’m 28, I’m starting to lose my hair, and all i seem to go to partywise is couples diner with my buddies and their girlfriends.

I’m slowly grasping the concept that it is very unlikely that i will live forever.

I’m atheist (and i find the concept of god about as plausible as Santa Claus), so there is no concolation in the form of hopes of an afterlife. You will not turn me into a believer without proof or rational argument, so spare me the religious answers please.

I’ve read some books about death and dying, and a metric ton of philosophy, but i still have trouble dealing with the concept that one day there will be no more me, i will just be nothing.

Have you faced your own mortality? When did you realize you were old? What prompted you to have the realization? How did you deal with it?

Do you have any personal experiences, good philosophy books, quotes or anecdotes about getting old?