At that age, it's pullet. Males have "smut" going from the barring in the hackles down onto the back most of the time. Actually, your pullet has way less coloring than most Delaware pullets do. I bred heritage Delawares for years, have just one 8 yr old hen left, my rooster passed away in 2015. Hatched quite a few from that flock. By six weeks, the cockerels have huge bright pink combs and lost of barring/speckles/smut.