And kick you in the ribs when you're down..
One of my professors in undergrad had a coffee mug that read: Father Time Will Kick Your Ass.
I wish I had known this in my 20's, I used to laugh at Father Time and spit in his face. I hope he doesn't hold a grudge.
I am mid-30s, by all accounts I remain pretty mobile and only a step slower than I used to be. Can the more "experienced" Redszoners give me some kind of sliding scale on the slope of descent from 25-30, 30-35, 35-40 etc.
20-25, lost 1/4 step
25-30, not quite a razor sharp as I used to be, lost another 1/4 step
30-35, became senile and curmudgeonly