I realised I was getting old when my everything started hurting.
A co-worker once told me, "When you are 40 or over and you haven't got any aches and pains you must be dead dead".
I laughed at that - I am 47 now and have stopped laughing quite some time ago.

I hate that smug expression on her face...
Seriously, though - while it's true that I do have my share of "ailments" I know that many people are a lot worse of - it's still ok.
I do get nervous, though, when I walk the dogs and someone comes up and says, "Oh, I often see your husband walk these dogs." Ummm...that's my 71-year old dad.

He doesn't look his age, though.
