Most 18 year old kids vote the way their parents vote. As much as I like having extra votes, what's the point of that?
New voting age: 25.
Exceptions: (1) 18 or older with proof of payment of a mortgage or rent apart from parents, or (2) 18 or older with a valid military ID (active or reserve).
To be eligible for POTUS, you must be 45 or older (maybe 50+), and not 35 or older. 35 was fine when you had people like George Washington being the surveyor for Ft. Pitt when they were 16 years old. Now, that would be considered illegal child labor. We have people who are 26 who are still on their parent's health insurance. Times have changed. Kids don't mature as quickly.