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> I now know many things that I didn’t know before, and I have access to more resources than I ever did.

Those are also measurable axes.

My single-bit ADC: if things that used to be stretches for me are now easy, and things that used to be impossible are now stretches, I'm still growing.

(I pushed strength and reflexes earlier in life; those areas are now no longer an option but on the other hand I've learned how to steadily progress in disciplines where one may take years to work through plateaus)