Is it possible to spend a lifetime shooting and not have ringing in your ears?
Yes. It is possible, just as it is possible to drive for a lifetime with no traffic accidents. The more you protect -- I have double protected for decades -- the longer you keep from the ringing effect. However, if surprised, and I jump at noise rather than flinching from recoil myself, somebody (as has been said) can ruin itlike a perfect driving record.
