As you get older, you start to recognize certain changes taking place. You sleep less. You take longer to recover from a workout. Certain things that didn't used to bother you are now really obnoxious. The music is too loud and lyrics don't make sense. You get up more frequently in the middle of the night to use the little boy's room.
These are all signs your body is aging. For me, the most noticeable has been my lack of potency. Before you get all weirded out, hop on over to my wife's blog and read her post. The following sentence will make more sense after you do that.
I've gone from hitting doubles to hitting singles.