Comment by Beltalowda

> Having said that, the fact that the 16-20 and 21-25 is so under-represented doesn't bode well for the future of the website.

I don't think it necessarily says all that much; at that age many are probably busy doing a lot of other things: going out, dating, studying, getting your career off the ground, whatnot. Things like children that you may have later in life also take up a lot of time, but the patterns of that are different (e.g. more "quiet evenings" at home).