our sample the mean years of education (M=14.0) was identical to that observed by Lyons et al. (2006) in their Vietnam Era Twin Study of Aging (which was based on a subsample of the same veterans included in our analyses), despite the fact that their participants had a mean age of 54.4 years at interview (compared to roughly 37 years for our sample when education was assessed). This suggests that any individuals interested in educational benefits from the military had taken advantage of this opportunity before 40 years of age.
