If you have Sick or wounded elderly (most likely Children as well) if you have elderly workers enabled then are cured of sickness or felt better turn into normal working Adults. Its not a bad bug quite useful really but a bug none the less. found this out at the begging of the game (you start with 5 adults 2 children and 1 elder) and I at one point had 7 adults, 1 child and no deaths.
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in the future i might handle sickness differently though