When I worked in baseball concessions as a teenager, the employees who were the most responsible and dependable were the university students. The older workers tended to be more experienced, but some of them were a little sketchy and a couple were fired for showing up drunk.

There is a tremendous variation between individuals. Part of the point of the university degree as a credential is to identify those people who are responsible enough to complete the program. I graduated at the age of 21 and immediately became an Engineer in Training, working on code that could kill people if it behaved improperly. I took that responsibility very seriously, and I'm thankful that my employer and coworkers took me seriously in return.

I fear that a focus on age tends to lead to prejudice. If you just want to ensure young adults can be allowed to make mistakes without ruining their lives, I would encourage you to expand your goal. There are many adults who could benefit from a bit more compassion and forgiveness. We don't need to restrict it to the young.