This link will take you to the syndicated columnist for the Dallas Morning News and his series of articles on living/retiring in Mexico. Be sure to scroll down to mid-page and click the box headed with "retire in Mexico series"
http://www.dallasnews.com/business/scottburns/columns/2003/stories/030203dnbusburns.cd888.html
By the way, I noticed a related link to the popular book "Living on Mexico Time." I recommend the book - the people may have bought before San Miguel became very popular - but they also were't the classic retirees looking for a spot in the sun. Both of them were mid 40's to mid 50's and continued their careers in Mexico.
David