As for age, most countries don't allow young people to drive or to drink alcohol or to vote. Why? To ban the young people who are generally immature and stupid from having too much power.
Okay first of all, Kids don't have the brain function to drive, vote, or drink because their minds are still developing and growing. Drinking would damage the brain at a young age. Driving would be dangerous. Also when you were 8 could you reach the pedals? Voting has an age limit because kids have no idea what politics even are and give them the choice to vote could just ruin the country forever.
Also a lot of kids are mature and although this has been said by a lot of people trolling is not just 18 and under.