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Based upon some facts from the ESA:

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3. The average game player is 35 years old and has been playing games for 12 years.
4. The average age of the most frequent game purchaser is 39 years old.
5. Forty percent of all game players are women. In fact, women over the age of 18 represent a significantly greater portion of the game-playing population (34 percent) than boys age 17 or younger (18 percent).
6. In 2009, 25 percent of Americans over the age of 50 play video games, an increase from nine percent in 1999.
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I'd say that the Adult market is definitely where the money is based on this.