I have been following your blog and Query shark for a bit now. I have seen multiple posts on YA novels (of the fiction variety) and am wondering if it is true that one cannot have the protagonist be a young adult without the MS falling into that category. If this is the case would most agents give a form rejection to a YA novel that is over 100K words?
Last time I looked The Lovely Bones was not YA but the main character was not an adult. That's the first example I thought of. There are lots of others.
YA is about age, sure, but it's more than that. It's about a kid navigating the increasing complex and bewildering world they're coming into. Often it's about figuring out gender roles, and trying to not look like a dork to prospective romantic partners.
I don't know enough about YA to know if your word count is high, but my guess is that 100K for contemporary YA is right at the upper limit. Dystopian, fantasy, historical all require more words than a contemporary but you still want to aim for 100K or so.
I've seen agents arbitrarily dismiss projects with word count that seems high to them.
I periodically send the lit team here into hysterics when I mention I've got a 176K novel here to read. They shriek "too many words" while hiding under the table.
I'll read stuff that's probably too long if I love the writing. I read it with my scissors in hand of course, knowing that I can usually chop 5000 words per 100K without losing a single bit of story. (My super power involves a machete.)
To answer your question directly: no, and I don't know.