Two-thirds of foreign-born 55- to 64-year-olds are in the labor force.
"By age, the proportion of the foreign-born* labor force made up of 25- to 54-year-olds (74.3%) was higher than for the native-born labor force (62.7%)." Among 55- to 64-year-olds, the foreign-born labor force participation rate was 67.2%, compared to 63.9% for native-born.
*The foreign born include legally-admitted immigrants, refugees, temporary residents such as students and temporary workers, and undocumented immigrants.
Bureau of Labor Statistics. (2015). Labor force characteristics of foreign-born workers news release. (p. 2 and Table 1). Washington DC: U. S. Department of Labor. Retrieved from http://www.bls.gov/