Are squeaky stairs/floors dangerous?

Squeaky floors are safe, except if you are not the one making the squeaking.

They're safe as long as they're not spongy feeling too. Squeaks are caused by the wood either moving against the nails or against another slab of wood. Some can be stopped by putting baby powder between the joints or screwing the boards down tighter. A spongy, squeaky floor can be water infiltration or poor support under the floor.

My house was built 35 years ago, has hardwood floors throughout the house, ever since I bought it 13+ years back, the floors in rooms squeak, 1 step of stairs also squeaks, I got washrooms redone about 8 years ago, I can hear a minor squeak when I stand in the bath tub, is it dangerous? Is it fixable?
Looking forward for an expert advise,
Thanks...