But the point is that just because you are old enough to vote, doesn’t mean you are necessarily mature enough to make certain decisions.
One could well argue that if the reason we are not allowed to heroin is related to health, or crimes due to addiction, then an 18 yo should not be allowed to use it, but a 90 year old would. I would even argue that we might want to allow hard drugs to 80 year olds, who probably can take responsibility by then.
I’ve already served in the military. What question am I supposed to ask again? Or do I need to re-enlist first? I’m not sure they would accept me at my age anymore.