I have always followed the charts and fed them the starter/then grower/ then grower layer. Dang I'm learning a lot. I feed them in the coop, but don't water there. I used to but it was too messy and caused a humidity problem.If they're feathered, they don't need starter anymore. I used to use pellets on my adult birds, but now I use crumble and keep the feeder in the hen house so it doesn't get rained on. We put the feeders in a large sealed bin at night when we shut the hen house door. To discourage mice.
So as far as chickens are concerned, young and old, they're still eating a crumble, even tho it's not starter crumble. Transitioning from a crumble starter to a pellet layer was a pain.