The Marvel Age line was a separate continuity from the mainstream Marvel Universe intended to a younger audience, re-imagining previous stories.
It didn’t last very long, but it was replaced by the surprisingly high quality “Marvel Adventures” line.
Doctor Doom’s appearances in both runs will be covered here.
MARVEL AGE continuity
Marvel Age Spider-Man #4
Marvel Age Fantastic Four #5-10
Doctor Doom & Power Pack
MARVEL ADVENTURES continuity
Marvel Adventures Fantastic Four