You are better off to feed an age-appropriate feed to your birds.
Chicks need higher protein when they are growing like weeds the first few weeks. Some areas, starter is available. In some areas, like mine, you can ONLY get starter/grower combination feed, which is 18% protein, is medicated with amprolium, the thiamine blocker that supposedly helps them build immunity to cocci (doesn't always help much, though, in truth), does not contain the excess calcium that chicks do not need, and that is what I feed until they are close to laying age and ready to go into the coop with adults.
Chicks need starter, doesn't matter if medicated or non-medicated, in truth. They can still have cocci, even on the medicated type, trust me.
Layers need layer feed with the slightly lowered protein and the extra calcium for egg production and no amprolium.