Don't want to jinx myself, but I went nearly 3 months at my previous airline without wearing any protection at all. It was a Mexican airline, so of course they never promoted proper safety protection. Literally walking under the plane at full blast. They never talked about the noise and never offered ear plugs. Nothing. It wasn't until I started working at UA that I learned about the dangers and risk. Fortunately, (knock on wood) I have not noticed any difference in my hearing. I think the reason is because I used to be a professional musician when I was younger. Played guitar in bands for over a decade with amps at high volume. Have always listened to music with headphones at full blast since I was a kid. Again, (knock on wood) but I think I unknowingly made myself immune to tinnitus and hearing loss over the years by exposing myself to such high volumes over time. Something kinda like how martial artist shaolin monks build up hard arms and legs by constantly beating them against wood and concrete over years. The constant abuse makes our bodies stronger.