Roasters are 3-5 months old, weighing 5-7 pounds.

Broilers/Fryers are young chickens, 7-13 weeks old, weighing 2-1/2 to 5 pounds.

You'll see the words "fresh" and "natural" used a lot when it comes to chicken. These terms have official government definitions. Here's the USDA definition of "fresh":

"The term 'fresh' may only be placed on raw poultry that has never been below 26°. Poultry held at 0°F or below must be labeled 'frozen' or 'previously frozen.' No specific labeling is required on poultry between 0 and 26°F.

"...the term 'fresh' should not be used on the labeling of raw poultry products that have been chilled to the point they are hard to the touch."

So in the context of chicken, "fresh" has to do only with the temperature at which it's been maintained from the time it was processed until the time you bought it at the store.