Pardon my ignorance. Do they always die at a young age or can they live a long life? How are there chick Cornish x if they can not survive, or is it because they are always chicks of two breeds? I'm asking because my son came home with two cornish x's and I haven't had the heart to tell him they do not live long. Can I just feed them crumbles and let them free range during the day, or are they just doomed?