Mine are four, five and six. The runners lay from early spring into late summer. If I gave them additional light they'd continue to lay longer. The mallards start early in the spring and continue until summer. As soon as I stop taking eggs the hens stop laying and go broody.

My Cuyuga is approx two years old, and she lays in the spring/summer only, she last laid in August, but she is my buddy and I love her anyway. My Peking duck that I bought grown has only laid a total of a dozen this year. A friend of mine said these types of ducks are more ornamental and don't lay very much,
However I used to have six French Rouen ducks and they laid from ten months of age, and they laid every single day for the three years I had them. Until a coon found them.

I figure my Saundra, a cute black/white Muscovy is 13+ years old. My oldest grchild is 15 and I got Suzette & Saundra when he was watching the show Milo & Otus. Suzette and my rooster died the same day and I think they died from Round-up that a neighbour sprayed along the fence. Saundra hasn't laid a egg for several years but she makes a good pet. I'll have to get Saundra a friend this weekend because our last Brown Hen died. She was 8 years old. She must have had a heart attack as she was dead under her roost when I went to let them out. It was so cute watching the hen and duck coming down the driveway towards the garden together. As you can tell, my feathered friends die off one by one.