Originally Posted by mnmom23
I like your term "age-stagnated." It helps to emphasize that keeping a child with their age-peers for academics is every bit as big a choice as academic acceleration. I'm going to have to remember "age-stagnated" and use it when questioned by disapproving others! grin

Stagnated is a good word, but age may not be the perfect prefix.

Subject-stagnated?
Grade-stagnated?