I am really not familiar with delaware, so when i got it from craigslist, they sold it as a delaware. It's probably a mix then or a poor hatchery stock.... but it still so sweet lol! What makes me thinks it's a rooster is the crest and wattles (compare to my other hens, it's crest is much more developed), however, when i look at pictures i see delaware hens have a very pronounce crest. As for the age, i dont really know either. I bought it on August 6th, so my guess is 10 to 12 weeks.