You're 29? Try being the token old lady at 37 ...
OK, seriously, I do think that certain programs are geared (consciously or unconsciously) toward "traditional" aged students 18-22. For example, I applied for an externship and went through the interview process only to find out later that only those with NO
summer classes and who were available for all rotating shifts were seriously considered. That's certainly that hospital's perogative to set up the externship program that way, but in practical terms it almosts guarantees that the students who are selected will be those without other responsibilities.
If you've been accepted, GREAT! Make the most of it. This will be a real world environment, with adults of all ages. It may not be nearly as uncomfortable as you may think.
Good luck, and keep us posted on how it's going!