Actually, we are primates, not monkeys, unless you're hiding a tail somewhere.
I think it's all biology, and women's visual attributes of youth and fertility attract males.
Men who are older have more resources and can fight off the younger immature and more poorly resourced mates.
Johnny Depp and aAmber Heard are a classic example of him pursuing her on the basis of her youth and fertility indicators- clear unblemished (undiseased) skin, long hair (good nutrition) good teeth, well formed symmetrical body with no rickets etc. He had money and could pursue her, and win her as his prize.
The fact that he was then emasculated by her and is now so very bitter and angry is another side of the same story in fact I'm surprised she's not been denounced as a demon lover, or a witch for robbing him of his manhood