I’ve had it since before I can remember. Since I was a little kid at least. It was likely due to frequent ear infections as a kid, but really don’t know for sure. The one fortunate thing for me is I can hear it, and it’s getting louder as the years go by, but it doesn’t bother me. It’s just part of me. I can tune it out, and often go weeks without even thinking about it. So, thanks for reminding me. /s