As others have said, it started around my mid thirty’s. That also happens to be when I started growing my own ghost peppers… hmm. There is a big difference between a few slugs of a hot sauce and something truly marinated in heat. I have had a few spicy chicken sandwiches that you have sign a waiver (marketing bs) that have had the effect, but were surprisingly not that bad going in. Anyway. Up your game if you can’t feel it yet. If your mouth can still feel anything, you’re not hot yet. You should reach beyond the sweat and start feeling a pleasant dizzy feeling and no feeling in your mouth anymore.