One theory is psychological adulthood is having individual agency, which babies and children clearly physically cannot have, and at some point as people age int

One theory is psychological adulthood is having individual agency, which babies and children clearly physically cannot have, and at some point as people age into competency they either get it and become adult, fake it and generally do relatively poorly, or never bother obtaining it and do very poorly. (edited to point out the article tip toes around this without ever stating or summarizing this) For any given task X that needs doing, you can either do it because it needs doing, only do it when tightly supervised, or not bother someone else will take care of it. Where X could be anything, go to the gym, raise children, a job or business, politics, all manner of things.