Some I admit have held up pretty good for 60-70 years old along with considering their life style but again some also look like shit imo and to boot they are still up there strutting like 20-30 year old cock rockers singing about girls and partying which is just embarrassing imo. If a musician or bands music matures with their age and becomes more serious along with the musician or band maturing in their attitude and performance then it works but when it comes to the aforementioned it doesn't and retirement is long over due. Even Grace Slick brought up such a point about performers.