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Might be good to also point out that probiotics and electrolytes are very different. When talking with my chickens’ vet about supplements, she said what others have already said here—that extra supplementation really isn’t needed or advisable unless a chicken’s sick or there’s another reason to give her a boost. Aart (chicken guru here who’s answered many a question I’ve posted) recently suggested giving some electrolytes when temps plummet, for example, which sounded like a great idea to me. I took that advice and my girls seemed to feel better. I bet exposure to hotter temps would call for a boost, too.Welcome to BYC!
If your hens are not actually sick, they do not need the extra probiotics.
Three years is only the beginning of middle age for most breeds. A lot of chickens (especially healthy backyard flocks) can live to be 8 or older, and most hens will continue laying weekly until the age of 5-7. Your hens still have some years of life ahead of them.