answer:For men, no. So many men in their 20s, 30s, and 40s are shaving their heads (by choice) that hair or lack of it is not a good indicator of age. Women are a different story. In my (non-scientific) count, the numbers of women over 45 that have hair lower than the back of their neck is about 10%. Which is a real shame. To me, older women with short hair have just said “I give up”. Maybe I am just an old hippie, but to me, if you have hair, be proud of it, whatever color it is. If I see a woman who is my age (60+) and her hair s dark black or even totally brunette, she is faking it. And that tells me something about her. I cam to grips with having my beautiful brown beard go grey about 15 years ago. Everyone knows that colors change. Live with it.