The world continues to age.

[Anarcho Nihilist]

List of countries by median age - Wikipedia

en.m.wikipedia.org

What will the endless aging of the population of developed countries lead to?

 

[Balikesir]

It will lead to a reduction in native europeans. I don't think european peoples can be fully replaced. It will stabilize somehow. Al Andalus is proof of this. A small state in the north conquered an empire. A minority disposed of a majority. This can happen again.