Hmmm... as a single 29-year old here in Uruguay... I'd say that the advantage starts to show only when you're older than, say, 25 - the older girls realize their looks aren't going to last forever, or want to have a baby and start to worry about having a husband able to provide. It's a bit cynical but I believe it's mostly true.

That said, I think there's hope for love too :) - only not always the kind you see in the movies.