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I haven't listen to the podcast yet, I'll admit--do you know what the biggest reason Kegan gives for no 5's younger than 40? (I.e. what does his theory say, not just 'we didn't find any')
@mattgoldenberg wrote a thread saying only people over 40 “default” to stage 5 under stress, which makes far more sense of his claim!
But also that seems like a reasonable way to assess where someone is *really* at, if you're a psychologist, like him, rather than an aspirational movement advocate, or a self-improvement-ist.
I think of it like an average. You can measure an average using mean, median, mode, geometric mean, etc. None of them is a more "real" way to measure average than any other, just depends on context. And all of them are simplifications of actual underlying dataset.
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Robert Kegan explaining his adult developmental theory, with 
