Most of the old guys at my field who wear hearing aids are the ones who have been using two strokes for years. I no longer fly two strokes just because of this reason. I tuned my last two stroke (an OS 61FX) at the field one day, and my ears were still ringing the day after. Yes, I was wearing hearing protectors. I certainly don't want to be wearing hearing aids when I reach 50.

By the way, this same topic has been discussed in the past. Just do a search for it in this forum.