Leo XIII was the first pope to be born in the 19th century and was also the first to die in the 20th century: he lived to the age of 93, dying on 20 July 1903, the longest-lived pope ever (as of 2020).
At the time of his death, Leo XIII was the second-longest reigning pope ( 25 years ), exceeded only by his immediate predecessor, Pius IX ( 31 years ).

Charles A. Finn, a priest of the Archdiocese of Boston and at his own death the oldest priest in the United States, served as a Mass officer at his funeral.
Leo XIII was entombed in Saint Peter's Basilica only very briefly after his funeral, but was later moved instead to the very ancient Basilica of Saint John Lateran, his cathedral church as the Bishop of Rome, and a church in which he took a particular interest.
He was moved there in late 1924.
Leo XIII was the first pope to be born in the 19th century and was also the first to die in the 20th century: he lived to the age of 93, dying on 20 July 1903, the longest-lived pope ever (as of 2020). At the time of his death, Leo XIII was the second-longest reigning pope ( 25 years ), exceeded only by his immediate predecessor, Pius IX ( 31 years ).
Charles A. Finn, a priest of the Archdiocese of Boston and at his own death the oldest priest in the United States, served as a Mass officer at his funeral. Leo XIII was entombed in Saint Peter's Basilica only very briefly after his funeral, but was later moved instead to the very ancient Basilica of Saint John Lateran, his cathedral church as the Bishop of Rome, and a church in which he took a particular interest. He was moved there in late 1924.
Pope Leo XIII