He is old in body but young in heart.

他人老心不老.

《简明英汉词典》

Still, she was young in heart and body and youth appealed to her.

然而, 她的身心毕竟都还年轻,青年人对她仍有吸引力.

英汉文学 - 嘉莉妹妹

When Huang Zhong makes friends, he is old by age young in heart.

黄忠交朋友, 人老心不老.接触人,不在于年龄!

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Youth is the young in heart.

所谓青春,就是心理的年轻.

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