Why is it rude to ask a woman her age but no big deal to ask a man? What if she looks really young and he is trying to make sure she's legal?

Jammaa
It might be rare but there definitely are some 30 year olds that can pass for 17.

My oldest brother doesn't like getting asked about his age more than me. The younger brother couldn't care less but seriously what's with the double standard? Personally I don't think it makes sense but if you could explain I'd appreciate it.
Why is it rude to ask a woman her age but no big deal to ask a man? What if she looks really young and he is trying to make sure she's legal?
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