Huh - If I'm holding a door and someone's coming, I hold it open to be polite, whether it's a man or a woman.
I do too! Back when I was taking public transportation I'd also give up my seat to those who looked as if they needed to sit down, male or female.
I also learned how to change my own tire rather than wait on someone else to do it for me. Now, I never turned down any help but I'll be darned if I'm going to be stuck on the side of the road waiting and waiting. It may take me quite awhile longer since I'll have to wrestle with the tire but at least I won't be at someone else's mercy.
As far as this shelf-life issue...I'd have to wonder what problems a man might have if he hadn't been married by the time he was 35. (Inability to commit? Perrenial playboy? Mama's boy? and so on.) The only 'shelf-life' I can concede women would have would be the limits to their ability to procreate.