getting old..

I think I'm getting old le, why do I say so

1) I can't remember what I wanted to do when that thought popped into my head 3 mins ago.
2) joint pain all over the body
3) not as alert as before
4) eyes are failing me.. (i used to be a marksman even with these glasses. Now I can't shoot for nuts.)
5) wondering what I'll be doing 20 years from now when I look at those ppl in their 40s
6) starting to get more and more naggy..
7) hmm.. still thinking...