Yep. The rock singer’s voice often goes through painfully bad decline after many years.

Notable vocal declines that come to my mind and are unbearable:

James Hetfield - Metallica

Geddy Lee - Rush

David Lee Roth - VH

Axl Rose - GnR (yes, already stated)

Geoff Tate - Queensrÿche (but to a less cringey amount)