IMO, as a member, who has had a 30 and 50 something year old brothers, if they let you in, they should have the respect to treat you as a brother, if not at least a man, In Sigma Phi Epsilon, most chapters employ a balanced man stance which means you are a brother with full rights and privileges when you join,
http://www.uwsigep.org/ is their website, check em out, if you want i can even get you in contact with their VP of recruitment so that they can answer any questions you have, also many chapters have a balanced man scholarship to help cover books, or even dues if you join. so i would say, enjoy your experience and being Greek is only going to make it better.