Would that apply to criminals of all ages, based on their intelligence / mental maturity? Plenty of incarcerated 18+ adults with less brainpower than this guy were deemed responsible for their actions.
There’s a lot of evidence to support this. I will present my own anecdotal evidence because hacker news loves that stuff. I acutely felt my decision making improve a few months before I turned twenty five. It hit me like a wave, and reflecting on my past decisions felt like looking at the actions of a completely different person. If I were in different, more difficult positions when I was younger, it is unlikely that my decisions would be as rationally thought out as they would be now.
I don't know if this actually exists, but I experienced something similar: Starting at around 17 I decided to ask myself at every birthday whether I thought I was more mature as a person than the year before, which I think relates to proper and holistic decision making. I kept saying "yes" to this question until I was 24.
And forcing Twitter to pay part of it, for their lousy "security".
Plus three months working in a shelter for homeless people