"which personality trait tends to increase with age"

Neuroticism tends to decrease during adulthood on the other hand Agreeableness and Conscientiousness tends to increase. 

A man's identity profile is along these lines gaged from their remaining on five wide ideas which foresee, among other life results, conduct and the nature of relational connections. At first, it was trusted that one's Big Five profile was static and dichotomous in that one was either at one extraordinary of every character or another