In modern times, children tend to block out the world with music: headphones being of help. The levels of music the children hear are different but are mainly high. When something is as loud as they have it at, they shouldn't be listening to it as much.
"Eighty decibels is twice as loud as 70 decibels and 90 is four times louder." No one should be listening to this type of level because " 100 decibels, about the volume of noise caused by a power lawn mower."
Parents tend to let their children use headphones for their children for multiple reason, watching. Movies, shows, or just listening to music. A study showed that "hearing loss in adolescents had increased to 19.5 percent in2005-2006 from 14.9 percent in 1988-1994.
http://www.nytimes.com/2016/12/06/health/headphones-hearing-loss-kids.html
