Not surprising, older houses tend to be constructed very well! Our last house was built in 1960, and I had the piano over the crawl space in that house as well. Very solid, when we moved the piano, it was like it had never been there.
Weāre currently in a rental house that was built in 1994 and the room with the piano is also over a crawl space. But when you walk through there, or around the piano, you can feel the floor move. Iām sure itās fine, but it just feels much less solid.
Although, itās not just the age of the house, but more so the construction, because the house weāre moving to was built in 1990 and it feels much more solid than the rental weāre inā¦.