Định Nghĩa và Ý Nghĩa của "young at heart"

What is the origin of the idiom "young at heart" and when to use it?

The exact origin of the phrase "young at heart" is unclear. It is a commonly used expression to describe someone who maintains a youthful mindset, energy, and outlook on life, regardless of their age. It signifies their ability to find joy and excitement in life's experiences, emphasizing the importance of maintaining a youthful perspective.