Well, in the Ch 13 featurette, Robert Carlyle states that hundreds of years have gone by since Rumple lost Bae. But whether that refers to that particular character, all of FTL, or the difference between FTL and SB is unknown.
Well going with what Caryle has said of Bae, that means Bae should be either dead or a few hundred years old unless he some how found the fountain of youth with Ponce De Leon.