Getty Images DEAR MAYO CLINIC: My teenager received new headphones for Christmas while my preteen asked for a drum set. It’s been a bit noisy around here. How can I protect their developing hearing? ANSWER: Hearing loss often is thought of as something that happens to the elderly. But we live, work and play in a noisy environment, and hearing loss affects the lives of people of all ages. The Hearing Health Foundation reports that nearly 50…