It’s because they don’t want any kids.
Sure, there are more specific “reasons,” but they are all vorgeschoben (phoney), whether the people giving them actually believe them or not. Like how in the latest survey two-thirds of childless couples asked actually want to have children but their financial situation, say, is too precarious or having kids would make their lives even more stressful than they already are, boo, hoo, blah, blah.
This all makes sense, sort of. As we all know, the human kind has never had children when the financial situation was precarious or the situation was stressful, right? Whatever.
No, they know perfectly well why they don’t want any children. 1) Once you have a kid it’s no longer about ME, MYSELF and I anymore and 2) Once you have a kid you would then actually be expected to take responsibility for it YOURSELF (even in Germany, well, for the most part). And taking responsibility for things just doesn’t cut the Kuchen around the country here these days.
79 Prozent finden den Alltag auch ohne Kinder bereits anstrengend genug,


