The authors analyze youth-adult unionization differences by using the National Longitudinal Survey of Youth 1979 (NLSY79) to follow a single group of individuals from age 15/16 to 40/41. They find that the differences between youth and adults are greatest at ages 15 to 17 and largely disappear by age 23. Though currently unionized workers are most likely to be in their forties or fifties, the authors find that younger workers have a greater opportunity or are more inclined to be unionized than adults and that many individuals report having had a unionized job by the age of 25. The authors also find that whereas the stock of unionized workers is largest at middle age, the flow of workers into unionized jobs is greatest between the ages of 16 and 25. Unionization patterns for adult workers are believed to differ significantly from those for younger workers. Bryson et al. (2005), for example, motivate their study of youth-adult differences in unionization by showing that unionization rates for workers aged 25-65 are three times higher than for those aged 15-24 in the United States and Canada, and two times higher in Britain. A similar pattern is evident in New Zealand and other countries (Haynes, Vowles, and Boxali 2005). Consequently, a number of studies specifically examine younger workers' attitudes towards unions (e.g.,