Why is it that most people these days think they have to either cut their hair really short or shave it off when they get older?

My grandmother's sister, Jenny, died in her 90's back in the `70's and had REALLY long hair!! These days, if you HAD long hair in your 20's, you get it cut fairly short in your 30's, then very short in your 40's and then you shave it off in your 50's!
Why? What's the point? Why does everyone have to be a skinhead?

Why is it that most people these days think they have to either cut their hair really short or shave it off when they get older?
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