Learning English - Grammar, Vocabulary & Pronunciation - Old head on young shoulders

Learning English - Grammar, Vocabulary & Pronunciation - Old head on young shoulders:
"Today's Phrase
'An old head on young shoulders', or 'a wise head on young shoulders' is a young person who behaves like an older person with more experience.

You can say someone 'has an old head on young shoulders' or 'is an old head on young shoulders'.

Examples

Brazilian footballer Pele, at 17, was the youngest player at the 1958 World Cup. But he proved he was an old head on young shoulders by helping his team win the tournament, scoring six goals in the process."