From a BBC news report
“People should listen to music for no more than one hour a day to protect their hearing, the World Health Organization suggests. It says 1.1 billion teenagers and young adults are at risk of permanently damaging their hearing by listening to “too much, too loudly”.
It said audio players, concerts and bars were posing a “serious threat”.
WHO figures show 43 million people aged 12-35 have hearing loss and the prevalence is increasing.”
(Hope I die before I go deaf?)