http://www.usa.gov/Topics/Seniors.shtml
U.S. General Services Administration
Senior citizens, and anyone working on their behalf, can access a variety of government services and information at this site . Links to these resources are organized around broad categories -- benefits (both cash and medical); health and nutrition; consumer protection; services (the Postal Service, housing, transportation, etc.); employment and volunteer activities; taxes; travel and leisure; education and training; and more.