Mr Burns actually did fairly well for a rock star
"Only about two-thirds of North American stars were still alive 40 years after their first brush with fame, compared with about 80 percent of a matched population—and there was never a point at which they outlived their non-famous peers. Typically, Europeans have greater life expectancies, but European stars did not, tracking the longevity of average North Americans for the first few decades."
Mega death? Rock stardom reduces life expectancy | Ars Technica