young, adj. 1. youthful, in one's salad days; adolescent, teen-aged, in the teens, pubescent, underage, minor; sophomoric, juvenile, childish, Sl. kiddish, Inf. like a kid, boyish, girlish, puerile, infantile; callow, immature, inexperienced, green, wet behind the ears; unsophisticated, uninitiated, naive, innocent, childlike; undeveloped, unformed, unripe; fresh, blooming, brighteyed, rosy-cheeked, budding, growing, unfledged, newfledged, baby; baby-faced, beardless, smoothcheeked, downy-cheeked.
2. active, vigorous, enthusiastic, keen; hopeful, sanguine, optimistic, confident, idealistic; cheerful, laughing, buoyant, light-hearted.
3. early, new, newer, recent, unheard-of. youth, n. 1. childhood, early life, salad days, boyhood, girlhood; adolescence, teens, teenage, teen years, pubescence; minority, nonage; heyday, springtime of life, bloom or flower of life, golden season of life, day-spring of life; immaturity, growing time, growing up; juniority, pupilage, wardship.
2. girlishness, boyishness, youthfulness, puerility, juvenescence, juvenility; freshness, vigor, light-heartedness.