Personality development across the life span: longitudinal analyses with a national sample from Germany

Area of Science:

• Psychology
• Personality Science
• Developmental Psychology

Background:

• Understanding personality stability and change is crucial for developmental psychology.
• The Big Five personality traits (Openness, Conscientiousness, Extraversion, Agreeableness, Neuroticism) are widely studied.
• Longitudinal studies are essential for tracking personality development across the lifespan.

Purpose of the Study:

• To evaluate the stability and change in the Big Five personality traits using longitudinal data.
• To examine both rank-order (differential) and mean-level stability and change.
• To investigate how personality trajectories vary across different age groups.

Main Methods:

• Utilized longitudinal data from a large national sample of Germans (N = 20,434).
• Participants completed a brief personality measure at two time points, 4 years apart.
• Employed structural equation modeling to ensure measurement invariance over time and across age groups.

Main Results:

• Differential stability of personality was strong, increasing in young adulthood, peaking in later life, and declining in the oldest old.
• Extraversion and Openness showed a decline across the lifespan.
• Agreeableness increased, Conscientiousness showed an inverted U-shaped trajectory, and Neuroticism remained relatively stable with minor fluctuations.

Conclusions:

• Personality traits exhibit considerable stability throughout adulthood, but with significant age-related changes in specific traits.
• Rank-order stability generally increases with age, suggesting a consolidation of personality structure.
• The findings provide valuable insights into normative personality development across the adult lifespan.