The first couple of years the bighorn was a single cam and then the last couple years they went with a two cam but i don't think they have made the bighorn for a couple years now.Soooooo,if it's a twin-cam it's probably about 3 years old and if it's a single cam it's probably about 5 years old.I know a couple guys that own the bighorn and they are very happy with their bows--i think they are one of the very best quality bows ever made for the price--about $200,but after reflex became real popular the prices went up on all their bows.