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There are several ways, generally only art professionals can do this but methods include calculating the quality of the materials vs. the yellowing, how deteriorated the painting is, cracking, the style and origin of the painting tells a lot about how old it is as wall, who it is said to be by can determine age, etc. I believe it's a very long complicated process but without the proper training and tools it's probably mostly just guesswork.

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15y ago

What else can I help you with?