quick google search, from Wisc DNR
Female walleyes grow faster and become larger than males. The males reach maturity in two or three years, when they are 12 to 13.5 inches long; females mature in four to five years, at lengths of 15 to 17 inches (Fig. 2). On average, walleyes live to be about seven years old, but older specimens have been caught.
and here is some good infohttp://www.aikenslake.com/news/a-look-i ... of-walleye