Is it illegal for someone under the age of 21 to buy cooking sherry?

It is illegal in Illinois

its not illegal unless you get caught

What state do you live in??

Interesting, a little searching shows that cooking sherry has salt added to a low quality wine and isn’t drinkable. (Though that probably depends on the drinker). But still, it contains alcohol, so it will be restricted by the same laws as any wine.

@Grisson: Thank you! I have always wondered about that.

Yet another reason to lower the drinking age:
Think of the children that will never become chefs!!