Answer: Based on your description I am not certain what the problem is, but here are some pointers. African violets grow from the center, and as the newer growth develops the older outer leaves eventually fade. Remove any wilted or or browned leaves and then inspect the crown or center of the plant for signs of insects. Also be sure that there is ample humidity -- grouping them together and setting them on a pebble tray can help. It is possible that the plants are simply in need of repotting, but it is more likely they have become old and should be propagated by leaf cuttings and then discarded. Do this in spring or early summer for the best results. You will find detailed instructions in the Q&A on starting new African violets from leaf cuttings.
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