Mating can start as young as 5 months eggs usually come with in the month, every duck is different though. I have Muscovy's so those that say hatched in spring or summer of 2015 won't begin mating and laying till spring 2016
I have a female and she's a saxony and I have a male he's a appleyard I think do you know when my saxony will normal lay... I don't know her age but I'll post some pics of her and him later so you can see them