21, why does it matter though? I'm not getting married or having children.
But seriously, I don't know who most of the men who frequent this site go to meet women, but there are a massive amount of women 30+ who are unmarried and interested in meeting men. I have only heard the term "damaged goods" in Mad Men, a time in which all these men seem to live.
If a woman has a high-paying career she is focused on, and she's not a moron, she'll probably wait until her mid-30s before getting married/having kids/settling down, this is especially the case with doctors, lawyers, investment bankers, surgeons, CEOs. They don't have the time when they're younger, they're focused on building up their careers. Once they have a little bit of breathing room, they decide to date, but they date with sense. They don't mess with all these "ain't shyt nikkas" (you know, may of them post on this site), they date other professionals, people who enjoy academics, art, reading, travel, their careers, etc. So if you're a 30 year old guy with sense, there is plenty out there for you. If you're a 30 year old women with sense, there is significantly less, but its still good.