You don't need your villager 2 b a doctor to heal someone, anybody can do it - even the kids!!
So make your bad stew and feed all your villagers then get 1 kid to heal them all, he/she will become an apprentice doctor - I haven't had a kid become a master yet but have had them as adept when they turn 14, makes it easier to get them 2 elders
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I lay there last night gazing up and the stars and I began to wonder................ Wheres my roof?