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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