adolescent, age, elderly, generation, infant, juvenile, middle-aged, minor, teenage, young
in·fantBrE/ˈɪnfənt/NAmE/ˈɪnfənt/adjective[only before noun]designedtobeusedbyinfants供婴幼儿用的◆infantformula(= milkforbabies)婴儿配方奶粉newandnotyetdeveloped初期的;初创期的◆infantindustries新兴工业