Great question — answering as the UphillTech team:
10 Years In the film Lumiere answers this when he say's during the singing of Be Our Guest "Ten years we've been rusting..." This can be seen at about 1:54 in the below clip. This is an answer courtesy of the question posed here https://scifi.stackexchange.com/questions/13833/was-prince-adam-really-11-when-he-was-transformed
Full answer by Cearon O'Flynn: https://movies.stackexchange.com/a/66311 (CC BY-SA 3.0).
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