At what age do you consider men start to become "old" and past their prime?

MCheetah
At what age do you consider men start to become old and past their prime?
It's well known that most men consider a woman 30 or older to be past her prime and pretty "old." But what about men? When do men start to be considered old and past their prime?

Personally, I'm 35 and don't feel nearly as old as I am. Mentally I still consider myself to be 24. I've always thought 35 to be like, when you start losing hair, can't stay up past midnight, and need Metamucil every morning or something. I still have plenty of energy and don't act as old and crusty as you'd think a 35 year old would.

So I think it might be 40+. Maybe 35 is the new 25?
At what age do you consider men start to become "old" and past their prime?
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