We'd have to agree with the tide of responses so far. Age shouldnt be a factor except for the age of consent rules. We have been to parties that the star of the evening was a young couple or a older "wiser" couple, but guess we thought that we were there to have fun?
Finding folks in your age bracket isnt hard as long as you talk to the hosts of local parties, sometimes they can even arrange an under 30 night theme.
D&K