younger Antonyms

elder older less girlish more qualified more practised more practiced more knowledgeable more geriatric more expert more experienced more aging more aged more accomplished more seasoned more senescent more senile less childlike less childish less boylike less boyish less babyish adroiter more versed more unyoung more trained more senior less youthful less pubescent hoarier grownup senior maturer mature grown full-grown firstborn first better greater full-size uppercase less juvenile less immature more knowing ancienter more mature in one's prime cleverer Grayer first-born