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Personality, for something that's supposed to be constant, changes a lot throughout life.

I'm referring to:
http://web.mac.com/kris_thomas/iWeb/Site 9/Resources_files/Factors that influence the temporal stability of personality by questionnaire-1.pdf

However, that's debatable, and I've seen other studies that report higher rates. That said, while it's an older study, it compiles a lot of research to come to that conclusion (of ~.50 long-term reliability), so it's a particularly good source. That journal also has a pretty high impact factor.
 

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MOTM August 2012
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Yes. But this data is more in line with say the Big 5. These are what the MBTI people would call persona-based metrics (notice their definition of extraversion is different than MBTI) so if we're going by personality from the sense of a snapshot of who a person is in a given moment, then yes you would expect there to be changes, sometimes substantial, especially as people age.

One of the reasons why MBTI is regarded as pseudo-science is because the measures its built upon are completely theoretical. Where Big 5 and other metrics in that data measure observable traits, like sociability, openness or anxiety, MBTI deals more with the core inner workings of a person (which of course is highly philosophical and not provable or falsifiable). MBTI really seeks to understand what makes personality (and what makes a person tick on the whole) not simply measure who the person is outwardly in a given moment. This of course flies in the face of accepted scientific methodology.
 
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