I have had houses from the 1920s to 1980s
My current house , built in the 80's was designed by the previous owner and he was fastidious on everything except electrical.
Steel beam support and most walls are supporting structures.
My 1920's house was built heavy, but not well.
The biggest problem was some identical houses on my block slid off the foundations!
My last 1980's house was built and insulated well, but had cheap windows. and gaps under the eaves and under the bottom of the cedar planking.
My FIl house was built in the late 1700's into the 1800's and when he sold it, we did not buy it.
That house needed a complete redo, including termite infested hand hewn support beams in the dirt basement. Needed new wood around the roof and to have the slate roof fixed.
Someone else took on the work and it almost bankrupted him.
I am sure he spent many times what it cost to buy just to get it into decent shape.
My Uncles house built in the 1800s (the added rooms had newspaper insulation with some readable from the 1860's) was all lathe and wood on typical stone foundation.
The PO had put a pot belly stove on the second floor, and the weight over the decades sank that part of the house.
Eventually my uncle got tired of putting money into it and sold it. They knocked most of the house down and only kept the 1860s part.
The original front room had been the town library around the early 1900's and had books from the 1890's up.
Both my FIl and my Uncles houses were hand built by their owners and other locals.
Both required huge maintenance, windows that would not open, poor insulation and lots of drafts.
I am happy with my 80's house now, least amount of work so far, just some roof leaks around the stone chimney and a few electrical glitches.
My 1920s house also had been redone quite a bit by the previous owner, he did the work himself and he had no idea how to do it.
I had to rip out walls, bathroom floor and a staircase to fix his inept updates.
Staircase with supports only on three sides, open live wires stuffed into spaces as they got closed up. Roof with multiple layers of wood and shingles.
When he redid the downstairs shower, he reused the tub and drain pipe, added a layer of tiles and screwed back down the drain, so there was a gap under the tub where water rotted out the woods holding up the floor. I figured it out before I fell through, but just barely, removed most of the 2x4s under the shower without tools !
Inspections are key and I hired good ones and worked with them on last two houses.
Did not want any more surprises!
So doing your due diligence with inspections and knowledgeable people is more important than age.