you can't put an old head on young shoulders

you can't put an old head on young shoulders

proverb A young person cannot be expected to have or display the wisdom and sound judgment of an older person. I know that you can't put an old head on young shoulders, and yet, I still get so frustrated with my son and the ridiculous things that he does!
See also: head, old, on, put, shoulder, young
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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Mr Ingham said details of what happened were unclear, but he added: "He was told time and time again not to do it," he said, "but you can't put an old head on young shoulders. And now he has paid the ultimate price."
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