infantile Antonyms

completely grown adulting drop-kick ageing of age older age-old fully grown sophisticated senior ripened ripe badass clunky completely adult been around in one's prime advanced in years up in years vaned of a certain age no spring chicken over the hill fully fledged full-fledged paternal old matured centenarian BIG antique antiquated antediluvian ancient ancestral anachronistic ageless aging aged classical cobwebby mature maternal grown grizzly grey gray full-grown full-blown fledged