If you need to wait 18 years to vote you shouldn't be able to vote once you are 18 years from average life expectancy (as in life expectancy is 80, you can vote until you're 62, not after).

Imagine how much focus would be put on healthcare if that were the case...

I'm not sure about voting but probably about being elected

I would think that removing the barriers to voting that affect younger voters is the better option, along with getting rid of the electoral college and allowing felons to vote. Taking away voting rights for certain classes of citizens is a slippery slope, especially when the root problem is some votes count more than others and many potential votes never make it to the polls.

they way leaders emerge from certain personalities, and get so corrupted, i think we'd be better off with random selection.

"no taxation without representation"

I wonder if you'll still firmly believe that when you retire.