There are trajectories of personality traits over the life span, I would hesitate to extrapolate them based on the trajectory of cognitive abilities though. One

There are trajectories of personality traits over the life span, I would hesitate to extrapolate them based on the trajectory of cognitive abilities though. One of the known life span emotional/personality trajectory is positivity bias, older people tend to be more positive. It is sometimes framed as negativity avoidance, that is older people tend to ignore negative things more often.