Conversation so far:
What was Luis Antonio Tagle's early life like?
At the age of three Luis Antonio Tagle was already able to recite the rosary.
What about Luis Antonio Tagle's family?
The Tagle family were from the Hispanic, lowland Christian aristocracy known as the Principalía, which were the elite prior to the 1896 Philippine Revolution.
Did Luis Antonio Tagle go to post-secondary school?
Luis Antonio Tagle was influenced by priest friends to enter the Jesuit San José Seminary, which sent him for studies at the Jesuit Ateneo de Manila University.
How long was Luis Antonio Tagle at Catholic University of America for?
Luis Antonio Tagle earned his Doctorate in Sacred Theology at the Catholic University of America from 1987 to 1991.

Question: When did he actually be come a priest?
Self-contained rewrite: When did Luis Antonio Tagle actually become a priest?