National Longitudinal Survey of Mature an Young Men (BLS)"The National Longitudinal Survey of Older and Young Men, a two-cohort survey, is part of the NLS Original Cohort project. The Older Men's cohort includes 5,020 men ages 45-59 in 1966, with data available through the 1990 survey year, the final year the Older Men were interviewed. The Young Men's cohort includes 5,225 men who were ages 14-24 when first interviewed in 1966, with data available through 1981, when active surveying was discontinued."