Thank you. That is helpful.12-13 weeks. 14weeks at the latest. In French, one would call them poussin [pron. +/- poo-SANG]. It's what traditional broilers are. If they get older than this they'll be tough if cooked in a broiler, hence the term "broiler". This and 14-16 week fryers are ideal useages for Med-type cockerels that are obvious culls. Spatchcocking them works out easily and quickly when you're slaughtering, and it's fine because one's not going to serve them as centerpiece roasters.
One could also gently sauté them in a cast-iron skillet, and then, after deglazing the pan, surround them with heavy cream and simmer them with a little salt, pepper, onion, and tarragon.