Conversation so far:
who was shot in santa fe high school
Ten people – eight students and two teachers – were fatally shot, and thirteen others were wounded in the Santa Fe High School shooting.
when was the shooting in santa fe high school
The Santa Fe High School shooting occurred on May 18, 2018.
how long was the santa fe high school shooting
The Santa Fe High School shooting lasted about 25 minutes until Dimitrios Pagourtzis was arrested.

Question: how old was the shooter
Self-contained rewrite: how old was the santa fe high school shooter