Mars bar was cancelled in America but exists in Canada and the UK
I ordered some on line and learned that the current alien Mars bars are closer to the American Milkey Way than the classic American Mars candy bar.
This difference may account for the speculative age of the galaxy
Since the Milky Way galaxy has been accreting for untold ages and is in fact still in a formative accretive state, it cannot actually be given an age.
Publix sells Mars bars. Straight from England if I remember correct.