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Myers–Briggs Type Indicator (self-report questionnaire)
(en.wikipedia.org)
A place to share interesting articles from Wikipedia.
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I'm also in my 40s, and I've flip-flopped between ISTP and INTP since my teens. I just took it again and today I'm INTP. Hooray for consistency, I guess....
p.s. if you take the test from the link, you do Not have to add your email to see your results. Don't give your info away.