Cohort differences in perceptions of age appropriate behavior during adulthood were examined. The specific question was to what degree members of three different cohort groups who share a common familial background differ on the degree of acceptance expressed regarding age appropriate behaviors. The sample consisted of three groups of women: college students, their mothers, and their maternal grandmothers. Subjects (n=256) were administered a questionnaire designed to assess adult behaviors in three broad categories: recreation, occupation/career, and family. Findings indicated greatest agreement on appropriateness of age constraints concerned family relationships while least agreement concerned those involving recreation activities. Younger subjects were most tolerant of behaviors performed by individuals at varying ages, while older subjects most closely adhered to age constraints. Results provided support for the theory of adult development that proposes that adherence to age norms increases throughout the lifespan. (Four tables are appended.) (Author/YLB)