While I agree with you on a fundamental level, this social contract is currently in the process of being eroded. A household with 60k gross income is part of the top 20% in terms of income. In a lot of parts in Germany today, this is insufficient to accumulate property if you want to have kids.

Pensioners are taking an ever bigger cut of the cake, both due to their rising numbers, but also relatively speaking. As a relatively young person with a good salary, it becomes ever more attractive to just emigrate, and this will lead to a pretty bad cycle Germany is ill-prepared to deal with.