Music
If you see any aged rocker nowadays, you can be pretty sure that they're deaf or nigh on deaf. That's because they didn't have access to the array of music earplugs we have at our disposal in the 21st century. Anyone who plays in a band, enjoys clubbing and going to gigs, or even, scrapes away in a top-flight orchestra, should be wearing hearing protection. Because once your hearing's gone, it's gone for good.