Babies and toddlers don't know shit, plus parents have an extreme amount of coercion over their children until they're teenagers.
Like I said we don't make this a prequisite for adults. There are plenty of disabled or old people fully dependent on others.
Also allowing children to vote will result in more political propaganda targeted at children.
That is an interesting point definitely worth debating. Propaganda would definitely be an issue, but this is the case not just in children, but adults alike. On the other hand with children becoming a voting block it might shift the focus slightly on topics benefiting them.
They deserve to enjoy childhood without worrying about the clusterfuck.
True, although I think children pick up a lot regardless. And importantly obliviousness of issues doesn't change how it affects them. Climate change and unfair pension systems for example will affect them regardless, this way they'd at least have a voice.
I think "teenager" is probably as low as you want to go for the foreseeable future.
I can for sure see how opinions can differ on the topic and I'd totally be ok with compromises and accepting some degree of hypocrisy. But nonetheless it's imo worth looking at the issue from the extreme.
As far as compromises go I think another way to go about it would be to have staggered voting with lower limits in more local votes. I could see how it might be more acceptable there for some.
Edit: also regarding babies and toddlers i'd think that they would need to express a desire to vote in some form, which would probably make it so you don't have literal 1 year olds voting (unless they are like an extreme genius, at which point they might aswell and it would only be a single vote of millions). Maybe one compromise would be to require some more active component below a certain age threshold, like having to vote in person for the first time or at least having to register somewhere (which if not done prior would happen automatically at a certain age).