I bought this duckling a couple days ago and he currently lives in a brooder; but as for the age of the duckling I'm not very sure at all. The only thing I really know is that I bought him on Thursday the 21st. Perhaps someone can give me an educated guess by the pic? That said, I have another problem. I don't know how long I need to be keeping him under the heat lamp, because last night when I went to bed, I had the heat lamp on his box. He was in the shadow on the edge of the box, so I figured I'd adjust the light so that the box is 1/2 in the shade and 1/2 in the light. If he gets cold, he goes to the warm, and warm he goes to the cold. When I woke up, however, he was still mingling in the shade. Does this mean it's too warm for him... or perhaps he doesn't need it at night.... because he's old enough to sleep alone? No idea. Also, sex is unknown. I would sex him but the thought makes me a little squeamish. He is a Crested Pekin.