I am for gradient voting. I don’t know if it has a name so I’m calling it that.
You leave home at 5 years old to participate in school as an individual, apart from parents.
You are criminally liable from age 0 onwards in 33 US states, with 11 years old at Federal level.
Of the remaining states who have minimum, 7 years old in North Carolina, 10 years old in Wisconsin is the highest minimum.
There are regulations at the school, town, city, county, state and federal levels that you must follow.
But even if you are not criminally liable yet or even if you are, you are a ward of your parents, the school (in loco parentis) or the state.
What you do in school is not isolated from the law of the land and the US quite literally a nation of laws.
Those laws are set by legislators, who are voted in and act as representatives for your interests.
If you have no representation, you have no say in laws that affect you.
This makes you a citizen that must abide by laws but without a voice, a separate voiceless class without any possible control over your rights and responsibilities.
In a gradient voting system, you would have partial votes. Fractional.
This gives you tangible experience in the democratic process that is real and measurable while mitigated due to perceived immaturity.
Fluid intelligence peaks in late teens and starts dropping off by mid 20s, more noticeably after age 30.
Crystallized intelligence increases with experience.
The claim of emotional regulation due to brain matter shifting location in the head has little bearing to ability to reason through information.
Different types of intelligence are at work, simultaneously, but to different degrees.