From an evolutionary perspective an expiration date kind of makes sense. Eventually, you're just an evolutionary relic and you're better off making room for you grandchildren. As cynical as that may be.But baldness, that I really don't understand. It's not just that it's a clearly unattractive trait, but it's also so predominant that it should get eradicated in the space of a few centuries.There are things about evolution that we haven't even begun to understand.