43 y.o. shitlady here. Dated online on Ok Cupid 3 years ago, found an amazing guy to love and met 1 or 2 other cool people. I'd say the wheat really separates from the chaff at age 35 and up. You've either completely let yourself go and have 3 baby mamas/daddies or you are hot, fit and successful at your career. Your life is kind of set by that point, so at least you know your fit date isn't going to descend into obesity once you commit. Something you can't be sure if in your twenties.