Many ancient kings who'd send people to war were themselves young or middle aged.

And we can see on Lemmy that tons of people explicitly want politicians of a certain age to be forcibly retired, be that age 80 or 75 or 65 or whatever. You're swinging young even by our standards. So we can conclude it is a slippery slope because it is kind of what people want, and will incrementally allow people to make what they want socially acceptable enough to pass bans completely. Which is, of course, what a slippery slope is.

Everybody else did the same with smoking bans. We have eyes that can see and ears that can hear. Come on now.

I don't even necessarily disagree with you. I just want you to think about what you're asking for.