"Turn that down! You'll ruin your ears," can be countered with "Keep on playing. You'll retain your hearing." NPR reports on a study about the hearing benefits of being a lifelong instrumentalist.
In the short run, we do have a bowl of earplugs available for the taking in the Reading Room. While they are mainly intended to block the noise coming from outside the building so you can concentrate while studying, they will also protect your ears in louder environments.
Playing An Instrument May Help Preserve Hearing:
Middle-aged musicians scored better on hearing tests than people who didn't play instruments. How we use our senses and brains can shape the people we become, a researcher says.