Tyler Cowen asks “Why is it that older people start going deaf, yet still object more to loud music?”
That one is simple: Human hearing is selective – that is, we have the ability to filter out noise to hear, say, human voices we are interested in. You can talk to someone at a cocktail party in a crowded room, and have no problem hearing them – especially if everone (rather than just a few) are talking.
As you go deaf, your ability to do that decreases – and you will object to loud music simply because it interferes with your ability to filter out signal from noise.
Or it might be that you don’t like the music, of course.