I was about 10 when a doctor that noticed the sinus told me what it was and to be very diligent about cleanliness down there. I’ve never had any problems until about 4 years ago (I’m 54 now) when I started feeling mild pain at my coccyx. I started daily applications of neomycin at the sinus and frequent cleaning. As long as I maintain that regimen all is good. But if I get lazy the mild pain will return.
I think I’m very lucky. After reading other stories, I’m now very motivation to NOT be lazy.