Given acidity is one of the 5 basic characteristics of wine, I suspect people, even adults, have been enjoying sour flavors for a few thousand years. Also, preserves have tended to be sweet, salty, or, you guessed it, sour for a long time, as well. They only thing that has really changed is our delivery vehicle for sour snacks.
So far you seem to be the only person to even mention OP’s actual question… But the answer reads like nonsense to me personally.
What is it like to enjoy sourness? (Is that even something that can be described?)
Given acidity is one of the 5 basic characteristics of wine, I suspect people, even adults, have been enjoying sour flavors for a few thousand years. Also, preserves have tended to be sweet, salty, or, you guessed it, sour for a long time, as well. They only thing that has really changed is our delivery vehicle for sour snacks.