The members of AC/DC have a median age of 64. Despite the changes in their lineup, the band have remained a respected and surprisingly powerful force in music - especially on a commercial level.
What's interesting is that although their members are largely anonymous to non fans, the press treats them with respect. There's no overpowering commentary about how they should retire and bow out gracefully, or of how they are no longer relevant, nor is there the constant assault on their credibility and the contribution that they make at this age.
All the fuss about Axl Rose joining the crew for the remaining ten dates of their tour is celebratory, and yet, Rose and Guns N' Roses I would say have made no fresh contribution to the world of music in over twenty years.
It's respect based on legacy and a far cry from what pop artists, and in particular, female pop artists have to put up with. Look at the last calendar year for Janet Jackson and Madonna and find me even one article that doesn't relate to their age and to how they shouldn't retire and bow out gracefully etc.
So, bottom line is, and I'm gonna be really generous here. If you're a rocker, and in particular, a male rocker, there is still no glass ceiling. No pensioner's bingo game that the press want you to go and play. But if you're in the pop world, and a woman in particular, it's another story entirely.