Akira Kitajima is a nice guy from Japan. He's 78 and started to play FPS when he was 65, his first game was Doom II. Later, he starts to love FPS games and wrote many walktrough in his website. His family is also happy as he found something too keep him from going senile.
His website: http://www.asahi-net.or.jp/~ku5a-ktjm/index.htm