I value a lot of things, including (as a smart guy) the young age of a girl: youth is the same capital of a woman as the mind of men.
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The smart guy understands that the mind with the years will not go anywhere (well to Alzheimer's, in any case), and youth is fast-flowing. It turns out that the male capital will remain, and the female will evaporate. And what, will your “smart” grandmother change every 3-5 years? There is no smarter place.