There is no misconception. Nintendo gamers tend to be younger on average. This is a fact.
Cited at 29 years as per Nintendo themselves circa 2007:
http://www.pcworld.com/article/140575/article.html
As opposed to 360/PS3 owners at 35-44, 44+ respectively circa 2008:
http://www.joystiq.com/2008/06/23/new-study-compares-360-ps3-consumers/







