We're still getting 8+ eggs per day from 12 hens. They are 9-10 months old. They are molting, too, nothing dramatic, they all look a wee bit scruffy and there are feathers everywhere but no one has bald spots or anything like that. They seem to be warm enough at night as they're sleeping in kind of a spread-out group but not all huddled together.
Most of my friends here who have hens say they lay regularly the first two years, right on through the summer and winter, and the lay rate typically tapers off after that but that's due more to age.
Some of them keep lights on in the coop during winter. I'm not sure that's necessary since we have 10+ hours of daylight even in winter. I'd rather let the hens' bodies do whatever they do naturally. If nature decides they need a rest they can have it. I've been scrambling and freezing raw eggs just in case they start laying fewer eggs and we need some stored as backup.
Our summers are 14+ hours of daylight. Maybe since the total number of daylight hours doesn't change all that much, it doesn't signal a big change in laying, either?