The words listed below are usually associated with levels of maturity, although it is possible for people of any physical age or level of emotional maturity to display the behaviors associated with the words. The words associated with an older age will give you an aspiration to strive toward when the opportunity presents itself.
Infantile – babyish, cherubic, childlike, infantine, foundling, neonate, newborn, newborn baby, babe, bambino, infant, neonate, newborn, nursling, bawling, wailing, sobbing, sob, snivel, sniveling, tears, weeping
Childish – attempt, effort, try, endeavor, endeavour, frolic, sport, fool, romp, revel, trifle, caper, frisk, gambol
Adolescent – young, growing, junior, teenage, juvenile, youthful, youth, lad, minor, young man, youngster, young woman, young person, lass, young adult, teen, teenaged, jejune, puerile, immature, simple, silly, naive, pointless, childish, immature, senseless, unsophisticated, inane, insipid, vapid, silliness; trivial, insecurity, ridiculous, foolish, petty, irresponsible, drollery, funniness, clowning, comedy, coquetry, flirtation, flirting, toying, dalliance, flirt, horseplay, diddle, toy, fiddle, trifle, mess around, dally, drama, show, performance, piece, comedy, entertainment, tragedy, farce, soap opera, pantomime, fidget, fool, monkey, putter, tinker, toy, trifle, twiddle, philander, womanize
Adult – caregiver, man, woman, grown, grownup, fully developed, full grown, individual, mortal, person, somebody, someone, soul, responsible
Mature – common sense, judiciousness, circumspection, discreetness, discretion, prudence, good sense, gumption, horse sense, mother wit, sense, discernment, judgement, judgment, frugality, frugalness, caution, care, vigilance, wariness, canniness, heedfulness, thrift, economy, planning, saving, precaution, foresight, providence, preparedness, good-management, husbandry, forethought, economizing, far-sightedness
Sage – sagacity, sapience, sagaciousness, sageness, wisdom, shrewdness, understanding, sense, insight, penetration, prudence, foresight, sharpness, discernment, perspicacity, knowingness, astuteness, acuteness, canniness, judiciousness, profundity, intelligence, awareness, ingenuity, acumen, clear-sightedness, discrimination, wit
Ourora – universal care, promoting universal kindness