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I have two largish containers of extra virgin olive oil. One is ~5 months old, the other is ~17 months old.

Any way to distinguish which is which?

George Menoutis
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"Unlike wine, olive oil does NOT improve with age. As olive oil gets older, it gradually breaks down, the acidity level rises, and flavor weakens. Extra virgin olive oil keeps better because it starts with a low acidity level, but it should ideally be consumed within 18-24 months of harvest."

https://www.oldtownoil.com/blogs/frequently-asked-questions/does-olive-oil-improve-with-age

ConlangersUnite
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    This doesn't answer the question. – DavidPostill May 11 '22 at 18:14
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    This sounds like the beginning of an answer, but you need to edit it so it addresses the question asked. How can you use this information to tell the difference? – GdD May 11 '22 at 19:11
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    As it’s currently written, your answer is unclear. Please [edit] to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center. – Community May 17 '22 at 21:33
  • So… if it becomes more acidic, litmus paper? – Joe Oct 08 '22 at 23:38
  • @Joe Litmus paper simply gives you a binary (red=acidic or blue=alkaline) result; so unless the ageing happened to bring the acidity level across that line, it wouldn't tell you might. I'd suggest something like universal indicator paper, which has a wide range of colours that can (approximately) identify a wide range of pH values. – gidds Oct 09 '22 at 22:21
  • @gidds : no, it changes different colors depending on the pH, but it might not be significantly different enough to tell by eye – Joe Oct 10 '22 at 00:23