Edit: found a reference that says parents must support children until they are 21 or have a profession to support themselves (presumably whichever is sooner -- I hope!).

> Edit: found a reference that says parents must support children until they are 21 or have a profession to support themselves (presumably whichever is sooner -- I hope!).

According to

> https://www.merkur.de/leben/geld/erwachsen-kind-finanzieren-...

if the child studies at a university, the parents have to pay for them until it gets its master's degree (which is typically much longer than up to the 21 years of age). There are exceptions, such as if the parents can prove that the child does not concentrate on his studies or if it changes the degree course "too often" etc. But assume that the normal case is that the parents have to support the child up to master's degree.