This is directly from the Yahoo! Finance article:

 

2. Green Valley, Ariz.

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The Santa Rita Mountains in the Sonoran Desert serve as a backdrop for Quail Creek Golf Course in Green Valley, Arizona. (Norma Jean Gargasz/Alamy)

The Santa Rita Mountains in the Sonoran Desert serve as a backdrop for Quail Creek Golf Course in Green Valley, …

POPULATION: 22,130
OVER 50: 92%

Another massive Arizona retirement community, Green Valley has a network of 13 recreation facilities and satellite centers. Members enjoy swimming pools, outdoor grilling areas, fitness rooms, tennis courts, shuffleboard, and a long list of additional amenities. Residents looking for other forms of entertainment can travel to theaters and casinos in Tucson, about a 40-minute drive away.

See the entire article here:  http://finance.yahoo.com/news/america-s-most-popular-places-to-retire-200205454.html