My intuition is that there's evidence out there that shows he cheated more, but people grow up a lot from age 12 to 19. That time period is basically the entirety of adolescence! I don't think it's fair to pin the actions of their 12 year old self on a 19 year old.
I did broadly equivalent stupid shit when I was 12, 16, 19... I don't think I mellowed out until I was 25-30. 19 is young, 19 year olds are generally still in their peak stupid teenager years. Crime stats back this up: https://pinkerton.com/our-insights/blog/age-crime-curve
