The floor on the upper floor vibrates extremely when walking

Good day dear community,

I am reaching out to you with a question because surely some of you have had the same experiences and are familiar with the topic. In our house, which we bought a year ago, we have the problem that the floor on the upper floor flexes and creaks extremely even with normal steps.
Briefly about the substructure:
It has a wooden beam ceiling with infill. OSB boards are laid on top of that. When we renovated, these vibrations did not stand out (or we did not notice them because we really had a very tight schedule and everything had to happen as quickly as possible).
Anyway, we laid impact sound insulation on the OSB boards and laminate on top of that. What could it be due to?
Do you think there is something wrong with the house’s statics? Or is it possible to get rid of the flexing by going in and really tearing everything out again including the OSB boards and possibly doubling the beam layer and building a Fermacell construction on top of it?
To explain the topic a little closer, when my daughter stomps in her room, our nightstand and wardrobe in our room shake — that can’t be normal....

I look forward to your answers and thank you in advance.
I wish you a nice Sunday.
PS: If I should now commission a craftsman to take a look at this: who would be the right one here? A carpenter, a joiner, or rather a floor fitter?
Many kind regards

Can only add a personal experience report. House built in 1980. Wooden beam ceiling, depending on the floor partially filled with loose fill and partially with some kind of concrete. Everything shakes when the children jump. Especially on the floor below. Maybe it's better in newer houses with a different structure or technically better decouplings, I always considered that "normal."

How old is the house?

The house is from the year 1958. Exactly such a concrete casting or whatever it is supposed to be is also the case with us. Of course, it's normal when the children jump, but it also sways when walking normally, which makes me suspicious.

It's the same with us. Wooden beams just sway. Jump on a log and the person standing on the other side will feel it. Try the same on a concrete pillar...

In newer houses, people have certainly thought more about decoupling, etc.

I would say just tear out the ceiling and make a concrete ceiling.

It's normal. You can't do anything.

Now, it's a subjective feeling what is strong and what is not. A wooden beam ceiling always has some give, but not so much that you have to be afraid. Over 60 years, the beams could also have been weakened (Schwam udgl.). Usually, OSB boards (with tongue and groove) provide additional support. I would look for an engineering office specializing in building damage assessment and get professional advice there. The diagnosis "you can't do anything" is too easy to make via the internet.