he bacome a successful poet when he was 20.改为同义句

he bacome a successful poet when he was 20.改为同义句
he bacome a successful poet when he was 20.改为同义句

he bacome a successful poet when he was 20.改为同义句
At the age of 20,he became a successful poet./he succeeded in poetry.

He became a successful poet when he was at age of 20.
Thanks.