One comment to add from someone who _didn't_ lose all his hearing and can still eavesdrop on things. I worked in a plastic factory for ten years. They issued free earplugs and free headphones to wear over the earplugs if you wanted. They trained repeatedly on proper earplug insertion (pull up the top of your ear so your ear canal is straight, insert till flush with pinna, wait for foam to expand). They had a hearing acuity screen every six months and gave everyone a break to go sit in the van.

Expecting young people to make individually good decisions based on advice from old people has limited reach. It's no substitute for a culture and regulations that make hearing protection easy and normative in the contexts where it's most needed. I don't know if we could create that culture for loud music concerts, but it would be a good cause.