Eric's age VS Scotty's age

In the film Eric Bates tells Jack that he is nine years old.
In reality Scotty Schwartz had just turned FOURTEEN years old!
That's right.
The Toy wrapped production mid June 1982
Scott Schwartz was born May 25, 1968
Meaning he turned 14 years old during filming.

And I'm sure about this filming schedule timeline because I found a Jet magazine article from April 1982 that talks about how Richard Pryor is currently in Louisiana filming a movie with Jackie Gleason.

I know a lot of Hollywood kids are older than what they seem, but I never would have guessed he was 14!?
Everything about him looked like a little kid.