Chris Fitzgerald is, probably, the first person mentioned who could play against a college student and not be creepy.
NPH would be great but the scheduling would be an issue. On the other hand...the season finale of HIMYM made it seem that he meets the "mother" next season. If so, how long can the show last once the mother is around?
"All our dreams can come true -- if we have the courage to pursue them." -- Walt Disney
We must have different Gods. My God said "do to others what you would have them do to you". Your God seems to have said "My Way or the Highway".