Is there a reason that men go for younger women?

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My husband is 31 and I'm 20. And told me that before we ever got together, one of the things he wanted out of a spouse was for her to be younger (5 years max). So...why do men go for younger women ?

I've asked my husband, but his response is that if a woman is younger he wouldn't have missed SO much of her life.

But do you think the general reason is?