For Which Age Group Should I Write?

Good morning!
I promised I'd specify the levels/age groups for picture books - also other books for youth.
Remember, this could vary--according to which book(s) you read.
Here's the leveling I like:
Early Picture Book - 500 words
Picture Book - 1,000 words (or fewer) 4 - 8 year olds
Non-fiction Picture Book - 2,000 words maximum
Early Reader - 3,500 words maximum
Chapter Books - 10,000 words maximum
Middle Grade Novels - 8 - 11 year-olds, 20,000-40,000 words
Young Adult Novels 70,000 words - age ranges vary
This is a guide to help you decide for whom you want to write and to begin your journey.
Happy Writing and Rewriting!