[anonporridge]

You're still missing the point.

Not having kids yourself but still having a retirement of any kind is a privilege that only exists if most people still have kids, so that their kids become workers who will provide the goods and services you need to keep living in retirement.

Government pension doesn't magically continue to work if everyone chooses the individually optimal solution of not having kids and consequently having a much easier time saving more money for retirement. If everyone executed this strategy, all that extra money you saved would become worthless, because there would be no one to give you goods and services in exchange for it.

[mcv]

If everybody suddenly stopped having kids, I think a lack of retirement would be the least of our problems. But you seem to feel as if only people who have kids are entitled to retirement, while people without kids don't have that right. And that's very much an opinion, not a fact.

It was the case in the distant past when your kids were your retirement, and even then people tended to work until they died, but that time is now in the distant past. At least in the industrialised world. There may be poor countries where this is still very much the case.