I have five little GLW chicks that I'm really hoping aren't all roosters (as I suspect). I'm unsure of age since I bought them at an auction but they're almost completely feathered out.
I have been reviewing the many posts in this thread with interest because I have a Buff Orpington and I'm trying to determine its gender. This guy/gal was hatched on Jan. 13, so it's about 27 weeks old. I got four chicks and this one is markedly larger than the others. It has a much larger comb and wattle, and it looks to me like it has spurs that are starting to develop. Additionally, it does not crouch in submission like the other hens do when I pet it.
The main things that are missing from the rooster equation is lack of crowing, lack of major difference in feathers from its sisters, and I haven't seen any mating activity going on.