Hey, I just wanted to say that most women even in their 40's are just as much into a guy's looks as women in their 20's and 30's. So, don't think that when you get to that age women won't care. They will, and you will find it harder and harder to look good as you age. For this reason, many women in their 40's, if they are single, are into much younger (handsome) guys in their late 20's and 30's.
If you go onto adult dating websites and check out profiles of women in their 40's you will see that almost all of them are 'friends' with much younger, handsome men. (not to sound

or anything ... I'm just sayin). And those are the kinds of men that they regularly hook up with.
And no, don't think that most women won't care about a guy's hair as they get into their 40's. Women will still care almost as much as they did when they were younger. I estimate that maybe only about 10% of women will lower their standards as they enter their 40's. When they become 50, well that is a little different, IMO, but even then they are still looking at 20-something guys.
reference:
my own personal experience