When do we get old

i've worked at the same place for 35 yrs this nov. when i started, there were a lot of old guys that soon started retiring. now, all the people around the same age as me are starting to retire. and i remember, all those old guys looked old. they looked just like people in old pictures from 20 or 50 years before then, just different clothes. but to me, and the others my age, we don't look like we still picture old(er) people looking :wtf:. the only people that look like that are the guys that left 10 or 20 years ago that come by to say hi. and i look around sometimes and wonder if anyone knows there's a bunch of juveniles (and i mean that in the worst sense of the word :D) running the place.
so i don't know when you officially become old, but i do know that if you sit your *** down and don't do anything, you get there a lot faster