Am I 26M too old for 21F Sorority party ?

Been dating someone for a few months and we’ve gotten more serious but she really wants me to come to her sorority party as she’s a senior in college. We met at the bar btw. Am I too old for this party ? Her friends really like me and are nice to me and have even called me hot and really wants me to come but I’d like to shake this too old feeling lol