Late 20s woman, started playing violin when I was 4, genetically predisposed. I had that SAME moment of shock and panic when I practiced with my sister before we played for my cousin's wedding a year ago. It was wild, the best way I can describe it is my ear has flattened out to baroque tuning down from modern 440 turning. I don't like it! I'm losing my best party trick to age but oh well, I don't think anybody's really gonna fault me if I'm off by a half step when I figure out what note a door is squeaking in lol