I'm 61 at the moment.
I've gotten teased that I'm "older than dirt" and if I'm in a teasing mood myself, I say, "You're right, I knew Dirt before he was a chip off the mountain that turned to gravel and then weathered into Dirt."
Well, anyhow, there are days I feel about 90 and other days I feel about 30, so it averages out pretty well.