There may be an argument that reducing the voting age could result in more politically engaged under-30s (and eventually, over-30s). At 18 most people have too

There may be an argument that reducing the voting age could result in more politically engaged under-30s (and eventually, over-30s). At 18 most people have too much going on (high school graduation coming up, studying for and applying to college and/or looking into employment, potentially seeking housing if their parents are kicking them out, etc) to have much capacity for political participation. That picture is significantly different just a couple of years earlier, where time and mental bandwidth is generally at more of a surplus, and so if people became capable of voting at that age it stands to reason that more would take advantage of it (and continue to after that).