actually, wait, how do you even calculate age in that case? is it based on how old she was when she was bitten by some other vampire? or on how old her body actually is (500+ years)? or on how old the drawing itself is? or on when the ip/character was first copyrighted? this is also assuming time passes the same way in gensokyo as it does on earth, in which case do you use gensokyo time or earth time (this will become a real-world consideration once humanity becomes spacefaring btw)? what about local age of consent laws? who has jurisdiction in this case? if all of that sounds like nonsense, then congratulations, fiction and reality are different and shouldn't be treated the same way
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