@mekkaokereke you can see just how low Italy's birth rate is here. Like Japan, the birth rate is well below the replacement level, so the population is shrinking leaving a shrinking younger population to look after a growing older population. I can see this happening in the USA too, but that's going to put a lot more pressure on an already fragile white male population, which is not going to help the numbers in the graphs you presented.
@craignicol
I have zero sympathy for any country lamenting "population decline." Population decline is not a real thing.
"Replacement rate" is not a real thing either.
Every country on earth with a shrinking population, could solve all of their population shaping problems with immigration.
There is no shortage of people that want to be citizens of your country. There's only racism and xenophobia.