I have seen a few (ok, many) hints of it coming for a couple decades:
----Dwight's wonderful red beard slowly gathering white (some of it from raising kids). I didn't worry about it, after all alot of people start getting white hair or losing hair as early as high school. And lately alot white and grey hair--on Dwight--not me.
----A few aches and pains, but even young people complain of aches and pains.
----Bifocals, I really think they give them to you when you turn forty whether you need them or not, so they don't count.
----Grandkids, getting closer, especially since one is 13!!
----But this morning I received the confirmation that we are "old people" --- two TV's on in two different rooms, on two different programs.
----We have arrived....