All the birds except the 2nd one look pretty young. I think I see sickles/hackles on the first one, and on the last ones, it looks like they are losing their "teen" feathers, so short of seeing them in person I'd say they are no more than 3 months old. Maybe they are pullets... but I wouldn't count on it from just those pics. Then again I can't see them in person so could be all wrong.
