A和B的年龄都是2岁，翻译成英语怎么说？

Question

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我需要用的是，the age of A and B is 2这种格式的，这么说可以吗？那么需要说成the ages of A and B are 2吗？哪种更合适？
我不是用来翻译这个句子，是翻译另外一句，不过大概格式和这个应该或差不多。谢谢！

Answer 1

Both A and B are two years old.
补充：
用 the age of ...翻的话应该是：
The age of both A and B is two.
age 要用单数。

Answer 2

Both A and B are two years old

或者Both A and B are two-year-old.

Answer 3

A and B are both two years old

Answer 4

they are two years old