Another thought about נער

that Potifar's wife calls Yosef a נער could help along the idea that Yosef spend 10 years in prison before speaking to the butler and spending another 2 years in prison. It is easier to call an 18 year old a נער than a 28 year old. This still does not help with the butler's calling him a נער to Pharoah, since then he would be 28 - 30.

I'll try to look again at the idea that נער means youngish servant in many an instance - it is looking better and better.