I don't think I can answer with an age. It depends on the work done with them. I would say they're learning to be responsible.... I'm answering in English; I didn't notice.
The purpose of the work we do with young persons is precisely to make them responsible for their behaviour. First, we try to make them realize what makes them act, what the dynamic is behind their aggressive behaviour or their lack of respect for others.
When we teach someone the reasons for his behaviour and show him how to be more responsible, I believe that, at the end of the process, that person is more responsible. Is there an age at which that's apparent? I would say we become a little more responsible every day of our lives. That's true for everyone.