Some people want to be older because it makes them seem more sophisticated and financially sound to you!
I would ask this person why they lied! That is not something to look past if you ask me! If a person lies to you right off the bat...then you have to wonder what else have they lied about!!!
Lying is lying! That makes this person dishonest! Figure out if you really want in a relationship with a dishonest person!!! I would probably say no and find someone new! However, most people ask for advise but never really use it! People do what they want to inspite of sound advise. Just remember that he lied to you! I would want to know why! I would really have a good converstation with this person and demand why and if there is anything else he has lied about...now is the time to come clean!!!