How long do Call ducks lay?

[Feathers Acres]

I found a 5 year old white call duck hen, how old are then when they officialy stop laying?

Im just wondering because I dont want to buy a hen that isnt laying.

 

[lowcountrypoultry]

I would imagine that it would still lay, but not as much as a younger hen would.

So production would be slow, but I would think she could still lay.