He is 12 years old.（改为同义句）------ ------is 12.
问题描述：
He is 12 years old.（改为同义句）
------ ------is 12.
答
His age is 12.
答
his age is 12
答
应该是：His age is 12.
（ 字典上对“年龄”的翻译：age year time of life）.
类似这个问题我问过"要命择"(姚.)他说:
12-year-old 不能作表语,只能作定语,如“他是一个13岁的男孩儿.”：
He is a 13-year-old boy .
12 years old 不能作定语,只能作表语：如“男孩儿12岁.”：The boy is 13 years old.
如“他是13岁.”：He is 13 years old.
感激不尽!