> You cannot sign up for the military, even though you might know how to aim and fire a weapon.
> You cannot vote in elections.
These two are both linked. In the US, military enrollment age was 20-45 (The Enrollment Act). Around the two world wars it was lowered to 18, primarily because they didn't have enough troops and most kids graduated high school at 18.
The 26th amendment set the voting age to 18 because that's what the draft age was already set to.
Neither had anything directly to do with developmental differences by age. The first followed social norms for schooling age and the second just followed along.
> You cannot purchase nicotine, alcohol, or other drugs. (In the USA this age is higher at 21)
There are many studies showing the risks of consuming these chemicals are much higher for people under the age of around 20. I don't know if those data were known before age limits were set, but there is a good reason to keep it today that has nothing to do with teenagers' ability to make decisions. Alternatively, I'd be just as happy seeing these also removed and us better teaching kids what the risks are so they can make their own decisions.
> You cannot vote in elections.
These two are both linked. In the US, military enrollment age was 20-45 (The Enrollment Act). Around the two world wars it was lowered to 18, primarily because they didn't have enough troops and most kids graduated high school at 18.
The 26th amendment set the voting age to 18 because that's what the draft age was already set to.
Neither had anything directly to do with developmental differences by age. The first followed social norms for schooling age and the second just followed along.
> You cannot purchase nicotine, alcohol, or other drugs. (In the USA this age is higher at 21)
There are many studies showing the risks of consuming these chemicals are much higher for people under the age of around 20. I don't know if those data were known before age limits were set, but there is a good reason to keep it today that has nothing to do with teenagers' ability to make decisions. Alternatively, I'd be just as happy seeing these also removed and us better teaching kids what the risks are so they can make their own decisions.