young at heart
词形变化：
形容词比较级: younger | 形容词最高级: youngest | 名词: youngness |
同义词：
youthful | juvenile | adolescent | offspring | new | children | babies | litter | brood | issue | progeny | little | early | undeveloped | fledgling | puerile | youth | untested | Loretta Young | unseasoned | untried | immature | vernal |
反义词：