Possible Clues:

• Modern Maturity grp
• Lobbying group for 50-and-over folks
• 50-and-over group
• Org. that gives out 'Movies for Grownups' awards
• Group that holds a National Senior Spelling Bee
• Group that grows as boomers grow
• Highest-circulation US magazine
• U.S. org. with over 39 million members
• Seniors' gp.
• __ The Magazine (formerly Modern Maturity)