How many of you have tinnitus/hearing loss because of using headphones/loud music over the years? Did you do something about it? If you don't have those, how did/do you avoid getting them?

I used an app on my phone to get a rough idea of the decibel level i listen at, and marked it on my amp's knob, then stay at or below that safe level -- plenty loud for me.

Something like this, as a reference, and 80db as my 'max' level marked on my amp.