He joined the Jesuits in 1586, and spent his life caring for the poor at a Milanese hospital, where he caught the plague and died at age 23.  
This Spaniard's father hoped he would be a soldier, but it should have been obvious when his first words were "Jesus" and "Mary," and by his vow at age 9 to keep his eyes always downcast to avoid ever seeing a woman, that a religious life was in store.  He joined the Jesuits in 1586, and spent his life caring for the poor at a Milanese hospital, where he caught the plague and died at age 23.  FTP name this patron saint of Catholic youth, for whom is named the Spokane alma mater of Bing Crosby and John Stockton.
This Spaniard's father hoped he would be a soldier, but it should have been obvious when his first words were "Jesus" and "Mary," and by his vow at age 9 to keep his eyes always downcast to avoid ever seeing a woman, that a religious life was in store.  
St. Aloysius Gonzaga