Minnie Minor shows up in 1864 NY Times as a 3yo (for a 3yo race) - so apparently she was foaled 1861.
http://www.pedigreequery.com/minnie+minor
It would be nice to note she was withdrawn from the (Paterson) Sequel Stk that yaer - I like to see at least some indication that the horse raced or whatever else she might have done. MM now in the DB has zero significant info, so is a "boring" horse.