I don't know but sometimes I used to have the problem of feeling like I was going to have a bowel movement when I pee'd. Your bladder muscles could be building up to compensate for the growth of your prostate. I suppose the only way to really find out is to go in for an exam if you're willing.

There could be other reasons as well but I am just giving you my example. I do hope more guys decide to contribute to this site. The prostate becomes very important to us as we grow older.