How Old Was Vashti When She Was Beheaded?

Where in the posuk do you see she was executed?

The Yalkut Shumoni Esther 2, says that Ahashverus’ anger subsided he was looking for Vashti and was told you killed her. He asked. why did I kill her and what did she do? It looks like he was under the influence of alcohol. The Midrash concludes some say she was exiled as she is not mentioned anymore and others say she was killed because she held back the rebuilding of the Beis Hamikdash.

See the previous discussion at https://www.theyeshivaworld.com/coffeeroom/topic/how-was-vashti-killed

She must have been at least 21, as Ahashverosh incited her to the drinking party, as it says that drinking was “according to the law”
Unless you want to say that she was under 21 and that is why Vashti refused to come.

But you would not think that the king, who did everything legally, would violate the law?! The tirutz is that she was one day before 21 and they had a healthy machloket whether to count previous night as the day, Vashti following a goyishe minhag of starting day from midnight hatzos. So she lost her head exactly at hatsos, otherwise after that she would have been able to come to the party.

So, we know her age exactly – one hair before 21.

I stand corrected by Gra! 18 not 21. Was this drinking age in Iran or Lithuania?

and, of course, in Iran drinking age is N/A, but in Lita it is 16! 18 seems to be the most popular choice all over the world (except where it is prohibited or no age limit).

In US, according to Wiki, it is still 18 in Puerto Rico and Virgin Islands. Given that Vashti was married, she got to be a Puerto Rican! Also, in Ohio you can drink with parents and in NJ underage drinking only gets a warning. Not sure whether the latter needs to be revealed or not.