How Do So Many Older Rock Stars Still Have Such Great Hair?

I always find it amazing how rock and roll stars in their 50’s and 60’s still have hair like 20 year olds. Could there be something they are doing or is it just the lack of stress of being a rock star has enabled them to keep their youthful look. Just some examples would be Sammy Hagar,Mick Jagger, Robert Plant and Steven Tyler.

Thanks

I can not comment specifically on any of these men, but I am personally aware of a few musicians that use either hair extensions or hair systems to give the appearance of a full head of hair. Long hair seems to be for musicians like hair was to Samson and I have been told over and over again, that without the appearance of hair, they can not perform well. Perhaps it is a confidence issue, perhaps it is something else entirely.