Does dating get harder as you get older?

I'm under the impression that dating changes as you grow older. 20's+ 30's+ I just wonder what really changes in girls between those ages. I mean a man who is in his early 20's has far different aspirations that a woman in her 30's. Does that mean it gets hard because usually all the good men or women vice versa are taken. Meaning the later you date the more you are going to be with a girl who's not all together downstairs and upstairs. I suppose the same could be said for men as well. .
Does dating get harder as you get older?
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