They're about 3 to 4 weeks old in this picture.

This was actually one of the photos I took of the litter that I got my kitten from. I almost got the one you see sitting in the middle, but ended up getting the one on the right. It was a tough choice, cuz I liked both of them a lot.

Not a great photo, but the lighting conditions made taking a good picture very difficult. When they were able to get out of the box, it got a lot easier.