Comment By the numbers... (Score 2) 397
At least by my experience...
"Properly" being defined as, the same as or equivalent to the majority, sane."
There are plenty of so-called adults, over 25 years of age in this context, that as you say "can not properly estimate risks, come to a rational conclusion, so on and so on". I am not joking.
I'd say there are way more adults with this sort of deficiency than teens.
Shall we bring up the topic of a citizenship test, even for the native born?