Not all. Keith Richards has gray hair and more lines on his face than a subway map. But he is still cool. Jimmy Page and Brian May eventually let their hair go gray (although they still cling to their 70’s hair style.)

And Peter Frampton, known for his bushy 70s hair, goes out and shows his balding head and (wisely short) white hair in all its glory.

But I have seen several 70s musicians who have had so many face-lifts, they are scary-looking.