All men are attracted to women who show strong indicators of fertility. This is a fact of life, irrespective of those two people.
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An 18-24 year old woman is like a fully ripe, blossomed flower as seen above.

After that, the wilting phase begins slowly but surely. There's no turning back:

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No amount of makeup, plastic surgery, exercise, or sexy clothes is going to stop it. Best case scenario, the process can be slowed down somewhat.

To her credit, Megan Fox has held off hitting the wall better than many.