I have many older hens currently ages 5-8 years. They are free-range and so get lots of exercise including chasing grasshoppers and other bugs. In addition to grass and insects, they have constant access to layer pellets and oyster shell. They also get excess garden produce during the summer, and live mealworms that I grow for them during the winter. I deworm them twice per year, and they take frequent dust baths which control mites and lice. I spend a lot of time interacting with and observing them, and this helps identify potential health problems that can be treated in the early stages. Finally, I have LGDs that protect my chickens from predators. I live in a very rural wooded area, and could not safely allow my chickens out of a secure, predator-proof coop and run without having dogs for protection.