1972 house with 174 sqm from the neighborhood

Then be proud of yourself that you have achieved something so great, because that is a big accomplishment. And don't use it to put others down who have taken a different path. In some courses of study, for example, this is not possible.

I am not putting anyone down here. I am just expressing my opinion. Or am I not in a forum where different opinions are expressed?

I would do it if a bank supports it - and you can also say that if the parents live nearby, then the start-up assistance for your house is also an investment in their old age. If you were to move away again, then you would no longer be available as support.

...
In some degree programs, something like that is not possible, for example.

Oh ... I don't want to start any discussion(s) now, but even during my (full-time) studies - which are among the more demanding ones - I almost always got my 20h/week complete.

This is not about showing who "worked" how much during their studies, but whether a 27-year-old, shortly before completing their master's degree, should/can buy a currently unnecessary house.

The can can only be clarified by the bank, the should/want by him.

The 420k€ will not be enough. Keyword furniture etc.

Would do it and also calmly take the parents' money.

The 420k€ will not be enough. Keyword furniture, etc.

Then you just take used furniture first. Sometimes you get it for free.

I would do it if the banks cooperate. I also don't find it bad to include the parents' money if it's necessary. As parents, you like to support your children if you don't need the money at the moment.