I don't know how old he is. =
I have no idea how old he is. =
I don't know what his age is.
祝你学习进步，更上一层楼！(*^__^*)
I don not know his age.
How old is he? I don't know.
其实这已经是比较常用的了 什么同义句转换有什么用？转换的结果就是让人越看越不舒服！其实再简单点就是His age is unavailable。
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