WILMINGTON, Del.--(EON: Enhanced Online News)--AstraZeneca (NYSE:AZN) joined the National Senior Games Association to launch competition at the 2011 National Summer Senior Games in Houston, the largest multi-sport event in the world for men and women age 50 and older. “We hope that all who attend the competition this year will leave inspired and with a renewed energy to actively manage their health and to help those around them do the same.”