I agree. They kept him at around 5 years old and still using baby talk for far too long. Whatever happened to Franklin going to that private school years ago? I went back and checked out the Fantastic Four run right after Heroes Reborn/Heroes return. It was after the Abraxas story where Reed used the Ultimate Nullifier and Sue became pregnant. In a story written by Carlos Pacheco & Raphael Marin (with an assist on the script by Karl Kesel), we see Reed and Sue taking Franklin to a private academy. But unfortunately when this creative team left or was replaced, we never saw mention of this again
Also, this is the first and probably only time Franklin's age is given and this issue is from 2009