You were born when the U.S. flag had 49 stars. That flag only lasted one year. Hawaii became a state on August 21, 1959, and the 50 star flag made its debut on July 4, 1960.Let's see what the age demographics are on this site. 
I'm 50 on July 12th of this year. [woot]
So for the moment, I had to pick the 40-49 category.
Woo hoo!! AARP benefits pretty soon!