"He looks young" 或者 "He has a young appearance" 是用英语表达"他长得很年轻"的常用说法。
来源：这是一个常用的日常英语表达。
例句：
He looks young for his age. 他看起来很年轻。
She has a young appearance, but she's actually in her 40s. 她看起来很年轻，但实际上已经40多岁了。
He must have good genes, because he looks young despite his age. 他一定有很好的基因，因为看起来很年轻却已经这么大了。