Final answer:
In the context of the Big Five personality factors, severe depression in older adults is associated with low conscientiousness and extraversion, and high neuroticism.
Step-by-step explanation:
The personality traits in the Big Five factors of personality associated with severe depression in older adults are low conscientiousness, low extraversion, and high neuroticism. People who score low in conscientiousness may lack the organization and discipline that could help them cope with challenges, while those low in extraversion might not seek social support that can be protective against depression. High scores in neuroticism indicate a tendency toward anxiety, moodiness, and sadness, which are associated with a higher risk for depression and chronic health problems.