I’ll be honest, I think its the same in the United Kingdom too. My, admittedly limited, contact with young people in Italy seems to confirm this - They seem a lot more informed on a political, cultural and emotional level.
I wonder if there is something about the Anglosphere that infantilises its young people?
Do you think that if 16 year olds in America were given more rights and responsibilities then this would make them act more mature at a younger age? There seem to be a lot of restrictions on young people in America (you cant buy alcohol until you are 21 years old for example). Maybe if we lifted these restrictions then that would help the younger generations become more adult?
In your Motherland (South Korea, right?) do young people have more rights and are young people expected to take on more responsibilities?
Maybe this is a factor.
So… giving 16 year olds the right to vote may actually make them more mature?
In what way are they not legal adults in Australia? Maybe they should be made legal adults and given the vote?