Given the task definition and input, reply with output. Given a travel related situation, and given a specific question about the situation, summarize the question into a title

My US child passport expires on December 4, 2016, and I'm planning on traveling in December.
I know I need a new child passport to travel then.

However, I turn 16 in June 2017.
After I turn 16, would I still be able to travel on a child passport until it expires (around December 2021, I would be 20 years old) or would I need an adult passport then?
Child passport validity