How old was St. Luke when he became a saint?

These five events described by Luke: the Annuciation, the Visitation, the Nativity, the Presentation and the Finding of Jesus in the Temple compose the Rosary. Of all four Evangelists, it is Luke who best reveals Jesus as the man and constant friend to the poor and downtrodden, comforting even the despairing thief who was crucified alongside him. There is some controversy regarding the details of Luke's death...even his age is a matter for speculation. Some maintain he was 74. Others that he was 84 or even 86. After preaching in Dalmatia, Gallia, Italy and Macedonia, Luke may have met his end at the hands of idolatrous Greek priests in Boeotia, who hanged him by the neck from an olive tree. However, other accounts propose that he died in Thebes and it is said that a secretion or balm from his holy body was used an an ointment to heal those suffering from diseases of the eyes. Miracles of Saint Luke's healing of ailments is believed to have continued for many years at the site of his grave, which would be visted by the faithful who came from both near and far. When the persecution of Christians came to a halt, the remains of Luke were transported to Constantinople under orders issued in 357 A.D. by Constantius, son of Constaintine the Great. It is in this location that his relics are now believed to lie, buried beneath the altar in the Church of the Holy Apostles, together with the remains of the disciples Andrew and Timothy. Luke, who never married, is venerated by the Church as a martyr. According to tradition, he was a skilled artist in addition to his other capabilities, and several pictures of "Our Blessed Lady" are attributed to his talented brush. Saint Luke's feast day is celebrated on October 18. He is the Patron Saint of Physicians, Artists, Brewers and Butchers and was referred to as "Paul's Disciple" by Saint John Chrysostom.