Excessive dust accumulation in older homes

“How to fix excessive dust / lint problem inside the house We live in a house built in 1962. We have one bedroom where under the bed there is always lint-like dust matter accumulating almost daily. I carefully mopped the floor in the bedroom moving all furnitures around and the next day I turned on the robot and there was still lint captured by the robot vacuum cleaner. I am surprised that in one day it'd accumulate that much. There is not much foot traffic to the bedroom but it's summer and the ”