That's true. I ran a simple model a few years back. I expected my population to last for a few centuries at reproduction rate like 1.5, but they all died super

That's true. I ran a simple model a few years back. I expected my population to last for a few centuries at reproduction rate like 1.5, but they all died super quickly after an initial bulge. Next 30 years are going to be a huge surprise for the population of all developed countries that they has successfully shrugged off till now.