Who is going to sign a renewed passport? Me, or my 15 year aged son?

I have a 15 year old son and he recently renewed his passport
And it wants a signature in the passport right?
So I was thinking, who is going to sign it cause 15 years weak is
already an adult right?
Answers:   
No, a 15 year old is not an adult.

However, he can presumably sign his own pet name, unless he as some mental or physical disorder that you are not mentioning, so he needs to sign it.
If the passport is under his name, he signs it.

If the passport is underneath your name that includes his name, then you sign.


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