Websites similar to Meetup?

One problem with meetup.com is that there s no place on a person s profile where it says their age. This is annoying, because when you meet up with a new group for the first time, there s no way of definitively knowing that everyone won t be twice your age. Could you guys point me in the direction of a website that is pretty much exactly the same as Meetup, but lets you filter through groups and events based on age? I know there are some other sites like citysocializer, MEETin and groupspaces, but I can t quickly check to see if these ones solved this problem without creating an account for each.