At what age do chickens start molting?? What should I expect? Never been through a molting process before!!

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My experience with hatchery birds bred to lay eggs has been: buy chicks in the spring. Pullets start laying late summer/early fall. They lay dependably through that first winter, the next spring and summer then slow down the second fall. They molt and usually take that winter off from laying (I don't supplement light), then start up again the following spring. That year they lay slightly less eggs but are still productive. Then each fall they molt and take the winter off, each spring resuming laying with again decreased production.So if they don't molt through the first winter, will they still slow down in egg production in the winter. and then turn around and stop all together in the summer when they have been laying a year?
So if they don't molt through the first winter, will they still slow down in egg production in the winter. and then turn around and stop all together in the summer when they have been laying a year?