Dem’s da rulez:
The Federal Standards of Identity for Distilled Spirits (27 C.F.R. 5) state that bourbon made for U.S. consumption must be:
Produced in the United States
Made from a grain mixture that is at least 51% corn
Aged in new, charred oak barrels
Distilled to no more than 160 (U.S.) proof (80% alcohol by volume)[17]
Entered into the barrel for aging at no more than 125 proof (62.5% alcohol by volume)
Bottled (like other whiskeys) at 80 proof or more (40% alcohol by volume)
Bourbon has no minimum specified duration for its aging period. Products aged for as little as three months are sold as bourbon. The exception is straight bourbon, which has a minimum aging requirement of two years. In addition, any bourbon aged less than four years must state the age of the spirit on the bottle.
Bourbon that meets the above requirements, has been aged for a minimum of two years, and does not have added coloring, flavoring, or other spirits may (but is not required to) be called straight bourbon.
Bourbon that is labeled as straight that has been aged under four years must be labeled with the duration of its aging.
Bourbon that has an age stated on its label must be labeled with the age of the youngest whiskey in the bottle (not counting the age of any added neutral grain spirits in a bourbon that is labeled as blended, as neutral-grain spirits are not considered whiskey under the regulations and are not required to be aged at all).
Bourbon that is labeled blended (or as a blend) may contain added coloring, flavoring, and other spirits (such as un-aged neutral grain spirits); but at least 51% of the product must be straight bourbon.
Boy, you guys seem like you have studied this bourbon subject. :)