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Thank you for your polite response. We may have to agree to disagree.
It is possible for some people not to develop enough myelin even into middle age, but it is not usual.
However, I take it by your name that you are not female. I tell you frankly that that is a bit of a handicap in discussing how girls think. Of course a girl who is 18 will defend her maturity. However, when she is 40, looking back over her life, she is likely to say things along the lines of, "I can't believe I was ever so naive."
I generally take men at their word when they tell me how they think -- as long as they have no special interest in me. Well, except for people like Brightstar. Some people are so unique that they must be their own case study.