Well, all I can say is I've NEVER wormed any of mine. But then, I don't keep them older than two years/seasons. So far, I've never had a problem with worms; although I once had a chicken with mites.Any old-timers, can you give us advice how old chickens should be when you start to worm?
At this point, I'm still not planning on worming yet, unless someone can convince me otherwise. I got chickens so my family can enjoy eggs that come from chickens that are not heavily medicated. So far, the only medication my chickens have ever had was medicated feed, which we stopped at 18 weeks before they started laying. Mine weren't even vaccinated.