If this is too abstract, substitute ‘make stuff’ for 20s, ‘make money’ for 30s. Reductive, but good enough proxies for most personality types. Stay tuned for what a simple substitute for 40s rule is. Will share if/when I figure it out.
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20s: Learn to be effective. Solve for avoiding futility (effort classifiable as ‘wasted’ a priori)
30s: Learn to be productive. Solve for raw energy. NOT efficiency: that’s for robots
40s: Learn to act with nerve. Solve for consequentiality. I have 6y left to figure out how 



