Age may have something to do with it. I read (don't remember where) that around age 40 our personalities tend to change in that regard: introverts may become mo

Age may have something to do with it. I read (don't remember where) that around age 40 our personalities tend to change in that regard: introverts may become more extroverted and vice versa. Unfortunately, I can't remember what, if any, the explanation given was.