Not as much the case as you might think and the Big Five model is largely reliable. Different traits can change over time, some are easier to change than other

Not as much the case as you might think and the Big Five model is largely reliable. Different traits can change over time, some are easier to change than others, they are also skewed if the individual suffers from acute mental health issues such as depression. Concienciousness is the easiest to change, via intervention, but takes a very long period of time. We tend to naturally become more conciencious as we get older. Openess is the hardest to change I believe, it's also a predictor of creativity and IQ, IQ being impossible to improve currently. The teenage/developmental opinion swings are a result of life experience and information gathered about surroundings rather than personality. Personality is mostly established by age 6. Lou