in one's prime

adult full-blown grown grown-up marriageable mature nubile of age perfected prime ripened

new small underdeveloped undeveloped unripe young

matured sophisticated

complete cultivated cultured developed fit grown mellow mellowed perfected prepared prime ready ripe ripened seasoned settled

full-blown full-fledged full-grown fully grown in full bloom of age

ignorant immature inexperienced unprepared unready unripe unsuitable

green young youthful