the.com/immaturity
The art of being old enough to know better and young enough not to.
means A lack of emotional or behavioral development appropriate to one's age or situation.
from From Latin immaturus, unripe — literally fruit picked before its time, now applied to humans who never quite ripened.
Brain biologyPrefrontal cortex finishes wiring around age twenty-five.
Not childishnessChildren get a pass; adults invented the term.
Survival traitPlayfulness and curiosity outlast it in healthy doses.