Two for me: coffee and sushi.
I didn’t start drinking coffee until I was in my middle 20’s. When I tried it as a younger person I didn’t like it because it was so bitter. It wasn’t until I was on a cruise (with my wealthy extended family) I had a fancy boy cappuccino and I was like “hot damn, this bitter water is actually good!” Now I drink at least 4 cups of coffee every moring.
I tried sushi in my teens and absolutely hated it, I remember gagging at the taste of the raw fish. Like coffee it wasn’t until years later as an adult I tried sushi again at a Japanese place in town and I was like “damn, this raw fish is really tasty!” Now sushi is a regular staple takeout food for me.
Hummus hasn’t yet been said yet, and it’s kind of cliche but in my early 20s that switch flipped.
I also wouldn’t eat the chunks of salsa, just dipping the chip in the juice, maybe a texture issue. Now most jars of salsa last less than 100 chips.
Used to be “always ketchup, never mustard”. Now it’s the other way around.