Having babies is a survival strategy in desperate economic circumstances and agrarian societies.

As emerging economies develop, the birthrate plummets.

We've seen this time after time. We're highly confident that the asymptote is understood. Global population trends have been studied for centuries.

Peace reduces birthrate. Longterm. Short term sure there is a post war baby boom. Don't mistake local issues and trends for longterm demographics.

Medicine has its limits. You can’t infinitely stretch a human life as it has its natural limits.

Nowadays, in large parts of the world new births a decreasing much faster than modern medicine is advancing life expectancy.

Look at charts showing birth rates of Germanys births, it’s below replacement since the 70s. Similar effects can be seen for other countries are in a similar situation

>Why will it decrease tho? Our medicine is only advancing and we are (compared to middle ages) living in peace.

Simple - replacement births are simply not happening

Human life span is approaching its [medically-enhanced] limit

And women, quite frankly, are - in gestalt - not having enough babies to keep population rates growing ad infinitum

There are exceptions to the rule ... but - globally - birth rates are below replacement level.

Birth rates are a tailing indicator, but they are still there.