well 1 out of 23 humans checking to see if random internet claims are true is better odds than i expected, well done sir

Okay but you're looking at more than just white people

Maybe true if you're comparing 60+ to under 5

The 1st 40years of my life i was told I had to worry about over population, in the last 5 I've been told I now need to worry about "demographic collapse"

It's not about infinite growth.

Given that not everyone lives to old age, we would expect children to outnumber old people even in a zero (or slightly negative) percent growth scenario.

I agree. I chose not to have kids for various reasons. And my "skilled" lol trade skills will die with me.

People think we need to keep growing the population. We're stuck on a single planet together. If we could live on the moon or Mars it would be a different story, but I think it's perfectly fine to decrease the population size back to 1980s levels, at least.

Unless there's some horrible disaster in the coming decades that will kill billions and harm wealthy old people less.

Not really, unless Gen Z starts having a fuckload of babies soon. Because each generation will be progressively smaller if the fertility rates don't rise.

It's not a huge issue in the third world where your kids are your retirement plan anyway so they have a ton more children. In the developed world, we have pension systems and stuff so on an individual level, having kids is likely bad for you financially, you want other people to have kids so you don't have to spend a bunch of money raising them, but their taxes pay for your retirement.

Unionizing opportunity.

While I half agree with you, that's definitely not the only issue.

Senior citizens become people to take care of, that won't/can't work and I don't mean that in a "dear God consider the GDP" way, but literally just people who will not be contributing but still require services, in fact likely a lot more than normal.

It ends up being a lot of neglected senior citizens dying in horrible ways.

As long as that high lifespan comes with a high healthspan, it shouldn't be a problem.

The US baby boom is not really meaningful on a global scale

Baby boomers also had more kids than the generation that preceded them. So did Gen X. Millennials are the first to fail to even replace their own population.

Even at constant population or even mildly declining, you would expect the young to outnumber the old by a bit. Given people die on the way to getting old and die whole being old more than the young die.

They may be even fewer than when the currently old folks when they were young but still be expected to outnumber the old