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How old are your chicks? From what I've read on here you can switch them to a grower/finisher after 4-6 weeks, or keep them on starter up to 20 weeks (but most seem to recommend changing to non-medicated feed after 4-6 weeks), or move to a flock raiser. I'm going to use up the bag of starter I have now, then put my chicks (currently 6 weeks) onto the same grower I have my pullets (17 weeks) on. Once I finish that bag everyone will go on flock raiser (I also have 2 older laying hens).
If you're mixing them with older laying hens you might want to look at a flock raiser so everyone is on the same thing, with some oyster or egg shell free choice for the layers.