The part you seem to be misunderstanding is that by stopping people at "a young age" you would be targeting non-voters. You are taking rights away from a future generation while protecting the current voting adults to have that same right. Even if that right is to slowly kill yourself while costing the tax payer, you are still being a coward and honestly a bit authoritarian by literally using a part of the population that has no voice instead of a full ban.

Oh, fuck off with your attitude. You don't understand people as well as you seem to think.