Question

When+I+was+only+a+13一year一old+boy同义句

Answer 1

When I was only a 13-year-old boy,... 当我是个13岁的男孩时，……

同义句：When I was 13,……
或者：At the age of 13,I ……

Answer 2

When I was only a 13-year-old boy 那时我才13岁
=When I was only a boy of 13
=While I was only a boy of 13