(They discovered that your personality becomes most stable during middle age - but then begins to decline again. People tend to be most neurotic in their thirties, and honest and conscientious in their forties.
Our personalities keep developing until we are in our fifties, for example, people in their 30s, showed high levels of neuroticism, but by the time they reached their 50s that had been replaced by conscientiousness, openness and honesty-humility.
So there is hope for the seflie generation yet.)