Maybe not equally. I know maybe like 10 old people. Most of them are very smart.
I've met several 2-year-olds. Dumb like a rock.
But should 12-year-olds be allowed to vote? I don't see a reason not to besides history. In the U.S. during Vietnam the minimum age was lowered from 21 to 18. Why not younger?
Realistically a lot of old people just vote for who the guy on TV told them to, or the party they joined 40 years ago. But we don't see disenfranchising them as legitimate.