I agree.
Kids that age don’t even know what “exasperating” means.
Hell, most kids in high school don’t either!
On the contrary, my kids had a vocabulary that used words like that because we didn't talk baby talk to them.
When my oldest daughter was 5 she used the word *prehensile* in a conversation with the nurse at the doctors office, and she used it correctly.
The nurses eyes got really big and she just nodded.