Abstract
(External link!) Krabat is a fantasy novel written by Otfried Preußler.
I found the story fascinating, albeit quite illogical: 12 apprentices work at the mill. Each year one dies, each year a new one appears with a start age of 14, each year all of them age by 3 years.
After 30 years there can be an apprentice who is 101 years old:
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Krabat_The_Satanic_Mill.xlsx [15 KB Excel file, open and use at your own risk]