The only feed that isn't safe for all ages, stages, and genders is layer. Layer is for actively laying birds only, due to the high levels of calcium. Starter and grower are fine for everybody to eat. You just need to have some crushed oyster shell available for those that need it.
Except that my June 2015 chicks stopped eating their starter when they were < 1 month old and were eating the layer feed from the hanging feeder. So what is a guy to do? The older birds were laying. Min calcium 3.7%, max 4.5%. Can't see that it did them any harm. They started hitting the oyster shell a week or 2 before they started laying. I ended up dumping the rest of the starter into the bin with the layer since no one was eating it in the brooder area.
Hey someone has a new avatar! Looking good @Blooie !