Yes, actually. There is a guild even for people 40 or over. My step mother was part of that guild. I've seen 50 year old's join this site as well. They exist, it's not like Gaia is just for children.
And one more year older doesn't make much of a difference in my book. We're basically in our mid 20's and my husband is three years from being 30. We're not old, but age appropriate for marriage and living our lives out. To me, I'm old enough to handle marriage. You may see it as young, but being that your only one year older then me, it really isn't. We're at an age that maturity is what we are striving for and growing up involves learning and finding ways to live our life out. Marriage is a sensitive thing though. Some manage it at a fair but still young age (mid 20's), some start out young (like 1cool, and some just wait until later (30's or after college).
So anyway, I'm not old, but I'm not young either. That might be just a different mental perspective from my side though.