Demographics for Japan, from the Nintendo (Kyoto) website:

Iwata: Last year, at this conference, I showed you this User Composition graph for Wii as of July 2007, when its installed base was around 3 million.

Iwata: The most recent proportions are like this.
Wii has been on track to steadily expand into the Japanese market and the user base in each age demographic is becoming wider.
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