When I was younger I for some reason thought butter doesn't go bad.
I found some butter that was two years old in my fridge. I made cookies from them, and ate them all.
I told my parents I finally ate that butter they gave me to take home with thanksgiving leftovers a few years ago and they looked at me like I was crazy and told me that butter expires.
the big issue with butter is rancidity, which increases oxidative stress on your body. but butter is mostly saturated, so even at room temperature it lasts months. two years in the fridge is probably fine
I told my parents I finally ate that butter they gave me to take home with thanksgiving leftovers a few years ago and they looked at me like I was crazy and told me that butter expires.
Now I'm not so sure.