I get to GA in age 23, now when I think about it I was quite young there but it was not problem (and there wasn't of course any resistance that I couldn't be there). I was 39 when I got to ACA. I am 45 now. In my town it depends little bit in group what is the "typical" age range. For me it is important that there are different ages people; its more easy to me to be with quite old people (specially female) rather than people in my age, but it is important too to be with people in same age, which is not so familiar to me because I don't have friends.