Construction costs are currently skyrocketing

Not at all. Anyone who buys inventory at these prices is either crazy or rich. Rich not in the sense of the German average income, and with an income of 60k€ per person you’re rich bla bla ;-) Because even after the renovation (around 150k€ I would agree) you still have a house that’s about 50 years old.

Because even after the renovation (around 150k€ I would agree) you still have a house that is about 50 years old.

Why is the general tenor here actually that houses >20 years are bad and should be torn down? My house is 75 years old and hasn’t been sneezed or blown away by the wolf yet. Well, it lacks the nowadays desired ugly columns at the entrance and I only have a ceiling height of 260 but I’m only paying for 15 years.

The main argument against older buildings for me was the lack of underfloor heating and the need to stick Styrofoam to the facade, because I absolutely want a monolithic construction...

Other arguments might be that you can plan your new building individually and a new building used to often be hardly more expensive than renovating an old shack.

It's like with cars. You can have it repaired after 10 years for a lot of money... but it remains old and the risk is high that something else will break two weeks later.
It's the same with old houses. You can renovate them, but the substance remains old.

PS:
And I probably watched the bargain houses on RTLII too often.
Where they just screw a few drywall panels in front of the crumbling clay wall and everyone is happy... question is for how long.

Why is the general tone here actually that houses >20 are bad and should be torn down? My house is 75 years old and has not yet been blown or puffed away by the wolf. Well, it lacks the nowadays desired ugly columns at the entrance and I only have a ceiling height of 260 but also only pay for 15 years.

Nobody said they are bad. Only that you have to be crazy to pour so much money into an old house. ;)

Nobody said that they are bad. Only that you have to be crazy to pour so much money into an old house. ;)

Why do you have to be crazy for that? I also energetically renovated my place from 1927. New roof with overlay insulation, new windows, blown-in insulation in the exterior walls, milled-in underfloor heating, etc. - plus all lines and pipes renewed. Comprehensive renovation - and now I end up at about 80 kWh / sqm. Not comparable in energy standards to a new building or an efficiency house, but still okay. In the end, I come to about €300,000 total investment, all in, with all incidental costs, new terrace, and kitchen. For people like me, who dare not approach new construction because they don’t want to commit financial suicide, this is a good way to get homeownership.

People often act as if everything built before 1980 can collapse at any moment and is unsellable...

Yes, that may always be different in individual cases. In our city, such old shacks are sometimes offered for 400 to 500 k€ plus at least 100 to 150 for renovation, you end up with a sum that is "crazy" for a 100-year-old house. At least that's how I see it. That is or can always be different regionally / in individual cases. There are such houses in the East in some regions already for five-figure sums. But do you want to live there? Just because the house is cheap? Usually not. That's why it is so cheap. Personally, I would never pay such sums, half or three-quarters of a million euros, for old houses. And again, nobody is saying that anything is falling apart. But overpriced and still old it is in many cases. For "romantic" reasons, many chase after such things and go into incredible debt.