We have 3 red stars, not our only girls, but the oldest. They are around 2 1/2 yrs. old. These 3 haven't laid an egg in close to 2 months or more. They would get around just fine ,but didn't seem to have any pep in their step. I have never wormed them before, I guess because I never saw any signs of worms. But I thought I would give it a go anyway. To my surprise, in just 3 days they were back to laying eggs and running around like the young ones. I couldn't believe it. Of course I did dispose of the eggs and will for about 2 weeks after the second worming. I used Valbazen 1/2cc down their throat. I just now wormed them again today, its been 10 days sense the first time. It made a believer out of me.