I hunted for this topic but missed it if it was posted before. How old should my girls and boys be? I have this alfalfa I would love them to get and get some sun as their cage is shaded. When I put alfalfa in the cage they go completely bonkers. Some of them STARE at me every time I walk by - 'Ain'tcha got no alfalfa????' They are 12 and 10 weeks old, but they are huge, absolutely huge. They are as voracious as piranhas.