Can a 8th grader take AP exam?

Thanks everyone’s response. The reasons for me to consider doing this:

(1) This is the 10th year of my son learning Chinese in our local Chinese school. He is currently taking AP Chinese class there. All other students in the class are high schooler, and they will taking AP exam in May 2021. They will register through their HS
(2) My son will choose Spanish as secondary language in his four year high school study.
(3) I can let my son taking AP Chinese exam during high school, but by then he will probably spend another 20-40 hours (maybe, big maybe) to prepare, so why not taking it now?
(4) Who knows how college AO interpret it? For me I don’t see any negative impact on it, but just save some time in high school

So, does this make sense?

Our local high school said that they don’t have space for middle schooler to take AP exam, so I am not sure what I should do and come here for idea. Thanks!