Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) aromatase excess syndrome ?
    ### Response:
    Aromatase excess syndrome is a condition characterized by elevated levels of the female sex hormone estrogen in both males and females. Males with aromatase excess syndrome experience breast enlargement (gynecomastia) in late childhood or adolescence. The bones of affected males grow and develop more quickly and stop growing sooner than usual (advanced bone age).
    