Hello Brokenrecord,
My average listening volume level for stereo music as measured on a calibrated DB meter is 68 to 80 db depending on the passages. I do crank it up for my surround sound/cinema rig ranging from 78 to 90 db. The higher range is usually explosion, engines, gun shots, etc. This is subjective but I do limit the 90 db listening to brief period to keep my ears happy. Btw all measurements are taken at the sweet spot listening positions.
Ps. Sometimes when we are just chilling we find 50 to 65 db to be just right.
Enjoy the music.