Instruction: Extract the value of the target attribute from the given product information and output it along with the corresponding source.

Input:
Product title: The Battle of the Bulge World War II Ardennes Battle Game (Avalon Hill Board Game, 1965 Edition)
Product description: Avalon Hill (AH)'s "Battle of the Bulge" board war-game -- first edition published in 1965. Developed with the technical aid of General Anthony C. McAuliffe, U.S.A. (Ret.) Contents include: a 4 page set of Basic Game instructions, a Battle Manual, 2 separate sheets outlining the German and U.S. "Order of Appearance", a two-sided Battle Results Table (Basic Game and Tournament Game), a Time Record Sheet, a full-color gameboard, a standard die, and 195 die-cut counters (including blanks).
Product feature: Battle of the Bulge, Avalon Hills, World War II Board Games, Ardennes Battle Game, 1965 Battle of the Bulge
Product brand: Avalon Hill
Target attributes: Age Group
Answer: attribute: age group
value: None
source: None