I think one of the facets of maturity is recognizing that you're not fully there and never will be, but also will never stop growing and trying. My grandpa lived to be 81, and he never stopped learning or trying to become a fuller, deeper person.
Some people get the self-knowledge facets of maturity first. Some gets knowledge of other people before they get clear on themselves. In some ways I don't like the way our culture sets it up that you can drive at this age but not drink until this other age and not rent cars until yet a third age, but in other ways it makes perfect sense that these things are not the same skill set, do not require the same set of self-knowledge, other-knowledge, organization, etc.
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Some people get the self-knowledge facets of maturity first. Some gets knowledge of other people before they get clear on themselves. In some ways I don't like the way our culture sets it up that you can drive at this age but not drink until this other age and not rent cars until yet a third age, but in other ways it makes perfect sense that these things are not the same skill set, do not require the same set of self-knowledge, other-knowledge, organization, etc.