Percent distribution of the civilian noninstitutional population by age, second- and third-and-higher-generation nativity, March 2005 Second generation Third and higher generation (Percent) (Percent) Age 16 to 24 years 23.1 16.2 25 to 54 years 39.9 54.6 55 to 64 years 9.6 14.0 65 years and older 27.5 15.2 Percents may not sum to 100.0 due to rounding.