Aaron Taylor-Johnson, 33, defends love for wife, 57.
They met when he was 18, she was 42.
Age gap love still interests people.
They fell in love on a film set.
They have four daughters together.
Aaron is protective of his family.
He values being a good role model.
They faced criticism for working together.
Aaron balances family and career.
He finds depth in his roles now.
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