“Maturity” is pretty much a stand-in for “desirable characteristics that adults usually have and children usually don’t,” so it’s almost by definition an argument in favor of adults. But to be fair, characteristics like the willingness to sit through/read boring informational pieces in order to be a more educated voter, the ability to accurately detect deception and false promises, and the ability to use past evidence to determine what is likely to actually happen (as opposed to what people say will happen) are useful traits and are much more common in 18-year-olds than 12-year-olds.
“Maturity” is pretty much a stand-in for “desirable characteristics that adults usually have and children usually don’t,” so it’s almost by definition an argument in favor of adults. But to be fair, characteristics like the willingness to sit through/read boring informational pieces in order to be a more educated voter, the ability to accurately detect deception and false promises, and the ability to use past evidence to determine what is likely to actually happen (as opposed to what people say will happen) are useful traits and are much more common in 18-year-olds than 12-year-olds.