I live in America, my child is 14 years old, he has German citizenship, his passport is overdue, what documents are needed to renew his passport, and how quickly this is done, thanks in advance.

I just had my passport renewed 8 weeks ago and Derrick's response is the accurate. Three weeks for the expedited is also what I got.

For documents, I recommend looking at their website and following the links at the bottom of the page to find what you need: https://www.germany.info/us-en/service/02-PassportsandIDCards/passport/941512 As for times, it takes about 3 days for a temporary passport or 3 weeks for a normal passport if you expedite it.