> Also is it really that big of an issue?

It's a titanic issue. Old people are expensive. They tax the young to pay for themselves. Now the system is running out of young to tax.

And that's the situation in rich and prosperous nations. I live in a developing country that has managed to be relatively poor and have a declining birth rate. It's so absurdly pathological it's not even funny. Symptoms include, for example, increased retirement ages. We will work well into our 70+ years of age, and we will be happy. Newer generations are already coping, they've already internalized the fact they will never actually retire. This is the stuff revolutions are made out of.