This study was designed to investigate the occupational movement and reasons for movement of men aged 45 to 59 between their first and current jobs, and more precisely to examine: (1) change and stability of various occupational personality types, (2) the effect of selected variables on change and stability of personality types, and (3) the relationship between job satisfaction and worker attachment to an occupational personality type by use of John Holland's theory of career selection. The data used were collected by the Bureau of the Census for The Center for Human Resource Research at The Ohio State University in 1966 as part of the National Longitudinal Surveys. A multi-stage probability sampling technique was used. Major findings indicated that Realistic types were the most stable personality types and that occupationally mobile individuals were different from occupationally stable individuals, blacks from whites vocationally, and Realistic types from the other five personality types. The most significant implication of this study for career development research was that it indicated the relevance of Holland's theory of vocational selection to older men now in the labor force and to the study of occupational mobility. (Author/MF)