Something fishy here--
List of dead USian rock and rollers you can real off in five seconds,
Jimi, Janice , Kurt, Elvis, Eddie Cochran, Gerry Garcia and all the Grateful Deads keybord players plus pigpen ..........
List of really old british rock stars famous for R+R abusive lifestyle:-
Mick Jagger, Keith Richards, Elton John, David Bowie, Lemmy, Bruce Dickensen etc.
List of oldish dead british rock stars:-
John Lennon, Fredie Mercury etc.
List of died really young British rock stars:-
Sid Vicious ....... & err Maddi Prior maybe.
These findings contradict common sense. But then again
"Rock Star", "Died Young" are both very subjective terms so
it wouldnt be too hard to juggle the parameters to come up with whatever answer you wanted.