I have always described my palate as "hidden pickiness" because I like so many foods it doesn't seem like I am picky but I do care & have things I will not eat.
As I have gotten older, it's mostly bitter things I can now appreciate (always liked spicy even when young) - mangos used to taste too much like vomit but now I taste only the delicious flavor and not the puke (though papaya remains out of reach) and I like mixed drinks with more of a bitter edge than before, and even chinotto soda. It's like the bitter element has decreased in volume, faded into the background and adds something delicious rather than just making anything bitter taste like bile. Swiss cheese, I used to dislike but now like, I taste a pleasant nuttiness to it, delicious. Still hate ketchup.
And only when very young could I like very sweet things. Kids can eat straight sugar, but once grown that is unpleasant as heck.
In music, I'd say my taste has broadened, certainly. I like more different kinds of music as I get older.