I'm an older guy I suppose.  Although I don't think being 31 is really all that old.  This is especially true if we use the adage only as old as you feel.  I feel pretty young actually with a new lease on life.

I also know that Sean's point to be true as I am seen as a good 5 - 10 years younger than my age.  My oldest son is 9 and often thought to be my brother.  People get confused when I bring out my other two so that doesn't help with passing.  I am not taken as seriously because of my appearance quite often which is frustrating.  On the other hand it can also be a blessing in disguise as I am given more of a leeway when I don't know all of the unwritten rules of male social behaviour.