What is the origin of the idiom "an old head on young shoulders" and when to use it?

The idiom "an old head on young shoulders" likely originated from the observation that some individuals possess a level of maturity, wisdom, or experience beyond their years. The expression "an old head" refers to someone who displays the wisdom and judgment typically associated with older individuals, while "young shoulders" signify their age or youthfulness. This idiom emphasizes the contrast between a person's youthful appearance or age and their mature and wise outlook on life. This expression is used to compliment or describe a young person who exhibits remarkable maturity, wisdom, or sensible behavior, often beyond their age.