... rushed to the hospital following possible cardiac arrest. Just the day prior, Jackson, 50, attended a rehearsal at LA's Staples Center to prepare for a series of 50 concerts scheduled to start next month at London's O2 dome and continue into next year. Elvis Presley , 42 (1935-1977): From the King of Pop to the King of Rock: Elvis Presley's health was rapidly deteriorating leading up to his eventual death, exacerbated by his drug habits. Presley holds the record for the most amount of No. 1 hits by ...