AARP is a nonprofit, nonpartisan US association with a membership of over 40 million. It provides information, education, research, advocacy, and community services through a nationwide network of local chapters and experienced volunteers.
It focuses its work on consumer issues, economic security, work, health, and independent living issues, and engages in legislative, judicial, and consumer advocacy in these areas.
Check out their website for wealth of information and advice on countless topics that concern anyone over the age 50.