I don't even know how to tell a child's age by height because I'm so
used to kids that are a head taller than everyone in their class.

We're all tall. I have a sister that's 5'8" and that's still 4"
taller than average, and her son's 6'8" and still in high school.

Most of us have big hands (and feet) too. I'm so proud of my big piano hands, lol.