I _am_, however, supposing that the late-onset type or types is either not an intersex condition, or at _most_, a very mild one: we could perhaps imagine a gender identity "switch" in the brain that can get flipped around (explaining the eventual need to transition) without much affecting other sexually-dimorphic parts of the brain (explaining how transition could be delayed so long, and come as such a surprise to others). This hypothesis is weaker than the autogynephilia theory, but still has implications for the ways in which transgender identity claims might or might not be validated by natural, prediction-motivated categorization schemes. If most trans women's traits are noticeably _not drawn from from the female distribution_, that's a factor making it less practical to insist that others categorize them as women.
I _am_, however, supposing that the late-onset type or types is either not an intersex condition, or at _most_, a very mild one: we could perhaps imagine a gender identity "switch" in the brain that can get flipped around (explaining the eventual need to transition) without much affecting other sexually-dimorphic parts of the brain (explaining how transition could be delayed so long, and come as such a surprise to others). This hypothesis is weaker than the autogynephilia theory, but still has implications for the ways in which transgender identity claims might or might not be validated by natural, prediction-motivated categorization schemes. If most trans women's traits are noticeably _not drawn from from the female distribution_, that's a factor making it less practical to insist that others categorize them as women.