Where is Girl's Can't Swim? It was released in the fall of 2000. Isild Le Besco turned 18 a few months after it was released.

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... Isild Le Besco turned 18 a few months after it was released.

Which is why it isn't here. This place has always gone by year of release, not month(s), when estimating age.
In many cases you'll also find that actual age when filming differs even substantially more than that of few months, this has almost always been disregarded on here in this context.