Self-concept differentiation across the adult life span.

This study used 2 measures to examine 158 adults' (80 men, 78 women; ages 20 to 88 years) self-concept differentiation (SCD) across 5 role-specific self-representations. Findings revealed that the 2 measures did not assess SCD in similar ways and that they showed different associations with age. Specifically, the 1st measure was not significantly related to age, whereas the 2nd measure showed a curvilinear, U-shaped association with age. The 2nd SCD index also showed significant associations with several measures of emotional adjustment and 6 dimensions of psychological well-being. Additional analyses showed that age moderated the associations between SCD and positive and negative psychological well-being. A high level of SCD was associated with lower positive and higher negative psychological well-being for both young and older adults. However, this effect was significantly more pronounced in older adults.