The popes are always old men, so they usually are 70 or 80 years old.
Pope John Paul I died on September 28, 1978 at the age of 65.
Pope John XXIII died on June 3, 1963 at the age of 81.
Which Pope John? There have been two.
Pope John IX died in 900.
Pope John XI died in 936.
Pope John XV died in 996.
John Russell Pope died in 1937.
Pope John XIX died in 1032-10.
Pope John XVIII died in 1009-07.
He was 58 years old when elected as pope.
Pope John VI died on January 11, 705.
Pope John VIII of Alexandria died in 1320.