Personality is largely plastic over the lifetime, being mostly set at about age 6. The easiest one to change is Conscientiousness and the hardest is Neuroticism

Personality is largely plastic over the lifetime, being mostly set at about age 6. The easiest one to change is Conscientiousness and the hardest is Neuroticism/Openness. So far we have no way to increase IQ and those two traits are largely expressions of IQ.