Does the alcohol content of a wine remain constant as it ages?

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Dear Dr. Vinny,

Does the alcohol content of a wine remain constant as it ages?

—Alan W., Atlanta

Dear Alan,

As a wine ages, different things happen to it: phenolic compounds link together and drop out of suspension to become sediment, the color changes, fruit flavors fade and secondary notes come into the foreground. But the alcohol content of a wine is determined in the process of fermentation, as sugar is converted into alcohol, and will not change as a wine ages.

—Dr. Vinny

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