According to the U.S. Census Bureau, Scottsdale, AZ was the oldest city in America in 2010. Youngest cities in America.

Place	Median age (years)
Scottsdale, AZ	45.4
Clearwater, FL	43.8
Cape Coral, FL	42.4
Fort Lauderdale, FL	42.2
Hialeah, FL	42.2
St . Petersburg, FL	41.6
Thousand Oaks, CA	41.5
Urban Honolulu CDP, HI	41.3
Torrance, CA	41.3
Centennial City, CO	41.1