What is a good running time for the 400 meter dash for a 12 year old boy?

Its really hardd, and my 40 year old son is running at a 1:01.28 time for 400m.

I am the mother of him and Im 41 years old and I can just make it 1:02:44. I am assuming for a 12 year old you should be able to run, between, 0:35 - 0:45.