Good link.
Not very surprising if you think about what many people put their bodies through. If you live in a city you are constantly assaulted by noise. There is very little letup. If it's not cars or television, movies, people, or headphones it's machinery. Fridge, oven, dishwasher, compactors, even lights can produce noise. Then we have health considerations that I'm sure affect our hearing. All the chemicals that we wring through ourselves, dust, foreign material that is bound to be corrosive to sensitive tissues.
I'm sure a whole long list is out there of things that affect our hearing every day, so by the time we're 40 or 50 who knows what we'll be able to hear?
