I would go the other way.  I don't even want adults that don't have skin in the game to vote.  And by skin I mean money.  If you don't pay for it, you don't get a vote.
For example, say a school district is funded by just property taxes, then only property owners that pay the tax get a vote.  If a 16 years old owns the property and pays the tax then they get to vote while a 50 year old living in an apartment paying no tax doesn't get to vote.