I copied this because I can't type it all on my phone.
Chickens are classified by age, here's the basic guidelines:
Broiler-fryer - a young, tender chicken about 7 weeks old which weighs 2 1/2 to 4 1/2 pounds when eviscerated. Cook by any method.
Rock Cornish Game Hen- a small broiler-fryer weighing between 1 and 2 pounds. Usually stuffed and roasted whole.
Roaster - an older chicken about 3 to 5 months old which weighs 5 to 7 pounds. It yields more meat per pound than a broiler-fryer. Usually roasted whole.
Capon - Male chickens about 16 weeks to 8 months old which are surgically unsexed. They weigh about 4 to 7 pounds and have generous quantities of tender, light meat. Usually roasted.
Stewing/Baking Hen - a mature laying hen 10 months to 1 1/2 years old. Since the meat is less tender than young chickens, it's best used in moist cooking such as stewing.