[InSteady]

I mean, population decline is a thing, and most 'developed' nations, or whatever you want to call us, are experiencing it. Demographic collapse sounds like a a scary term bandied about by people with an agenda (or those who want to proclaim the sky is falling but bizarrely want to ignore climate change and ecological collapse).

I'm just guessing, because I haven't encountered the term and I'm not finding much about it on google. Certainly nothing from scientific or authoritative sources. I guess one article from FT uses the term to describe China's population decline.