The birth dates and even years of early Popes are frequently not available. In modern times, Popes have generally been elected at older ages. Today a man of 65 years is generally considered too young to be Pope. The youngest Pope was probably either
+ Pope Benedict IX who became Pope at an unknown age between 11 and 20
+ Pope John XII who was 18 at the beginning of his papacy
Benedict IX was around 18 to 20 years old when made pontiff, although some sources claim 11 or 12. Or is may have been Pope John XII (who was 18 at the beginning of his papacy). In either case, both of these pontiffs were vile, immoral and disgusting individuals who should have never sat on the Throne of St. Peter.
Pope Benedict IX, who some say was only 12 years old at the time of his election was the youngest pope. Others say he was 18 years or in his early 20s when elected the first time in 1031 and is the only pope to have served more than one term (3). He was less than a 'Holy Father" and was eventually deposed and excommunicated.
Pope Benedict IX was probably the youngest and, perhaps, the most vile and disgusting individual to sit on the throne of St. Peter. Some say he was 10-12 years old when his father purchased the papacy for him. Others say he was 18-20 years old. Another possible contender was Pope John XII who was 18 years old when he began his reign. He, too, was a coarse and immoral man.
Some sources claim that Pope Benedict IX was chosen pope when he was only 11-12 years of age. Others state he was about 20. Click this link and you decide.
Pope Paul VI was elected pope after the death of Pope John XXIII.
John Paul II
There is no pope named Pope XXIII. If you are referring to Pope John XXIII, he became pope in 1958.
Pope Francis is the reigning pope in 2013.
The current pope is Pope Benedict XVI.
Pope Pius III was the predecessor of Pope Julius II.
Pope Benedict followed Pope John Paul II as pope.
It was Pius XII. He was pope from Mar. 2, 1939 to his death on Oct. 9, 1958.
Pope Pius I was the 10th pope.
12 popes have taken the name "Pius". Some of them were also canonized as saints. Pope Pius I, saint, Pope 140/142 to 155 Pope Pius II, Pope 1458 to 1474 Pope Pius III, Pope in 1503 Pope Pius IV, Pope 1559 to 1565 Pope Pius V, saint, Pope 1566 to 1572 Pope Pius VI, Pope 1775 to 1799 Pope Pius VII, Pope 1800 to 1823 Pope Pius VIII, Pope 1829 to 1830 Pope Pius IX, Pope 1846 to 1878 Pope Pius X, saint, Pope 1903 to 1914 Pope Pius XI, Pope 1922 to 1939 Pope Pius XII, Pope 1939 to 1958
Pope Francis is pope number 266.
Pope Benedict XVI was the 265th pope.