Is considered YA by whom?Nothing is black and white. My second book I'm writing is considered YA even though the MC is 10 going on 11.
Whenever it makes sense to do so. Some examples in the market you can look at are Orson Scott Card and JK Rowling, both best-selling authors, who have young characters that age over time for different reasons. Card usually starts around 6 (Ender's Game, Songmaster (3 years of age?), Alvin, etc.), and Rowling did HP starting as a baby. Robin Hobb is another author. These are usually for characters you're going to see a lifespan of. Orson goes all the way to elder, but HP ended as a teenager.
Harry Potter is middle grade, and Ender's Game is both adult and written at a time when there wasn't a YA market the way there is today. There's a thread about whether Ender's Game is YA or adult going on right now. Using these examples for YA is misleading to authors who want to know what constitutes YA fiction in today's market.
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