Lucy was martyred at the age of 21 and became a saint at that time.
Saint Matthew was a tax collector for the Roman government. Next he became an apostle of Jesus Christ. After he was martyred he became a saint.
He was the only Roman emperor who became a saint.
It may be the day they died (became a saint) or it can be almost any day. There is no firm rule.
Saint Therese of Lisieux became a Carmelite nun at age 15.
She was alive. Once she ceased to be alive, she became a saint. Beyond that fact, there is no reliable information about the life of Saint Lucy.
There is no Saint Faithy. There may have been a Saint Faith who became a saint by dying for her faith as a martyr.
Saint Nicholas
He became a saint.
The actual date of when Valentine of Rome died and became a saint are unknown. We do not know his age.
Saint Lucy was about 21 years old when she was martyred and became a saint.
Saint Lucy was 21 years old when she was martyred.