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It's also for biological reasons. Older men are sexually and physically developed as well as more psychologically and emotionally mature, other than having financial stability which is attractive to most women.
Note when I say "older men" I'm referring to men who are older than women they're dating. This gap can be huge or somewhat short, but it exists in a good portion of relationships. Many teenage girls are attracted to men in their 20's; women in their 20's, on the other hand, are attracted to men in their 30's or pushing 40's.
I can cite more evidence if you need it.