Everytime since I was young I have recived pre-check and continue to at 23

I have no real clue why... I have just always gotten precheck. My family thought it was because I was a kid. But still into adulthood I always get pre-check... WHY? It's out of chicago. the literal only thing I can think is my cousin with the same last name is a flight attendant, but that makes no sense because my parents would have it.