Studies on the big five factors of personality found that transition into late adulthood was characterized by increases in the aspects of impulse control, reliability, and conventionality. to which big five personality factor do these aspects belong?

The answer is "Conscientiousness".

Conscientiousness is the personality trait of being cautious, or careful. Conscientiousness infers a want to complete an assignment well, and to consider commitments to others important. Honest individuals have a tendency to be effective and composed rather than agreeable and messy.