I always pictured a young man, perhaps Luke's age or older, that Kenobi encountered and 'took it upon himself' to train as a Jedi. This opinion is corroborated by our ROJ glimpse of Sabastian Shaw, along with the force-ghost he produced, depicting a man not a whole lot younger than the geriatric Kenobi. So I question why, in TPM, Lucas considered it imperative to slide Anakin's age as far down as possible, at the expense of creating questionable continuity between the trilogies? Certainly a twenty-year old Anakin - a far more credible hero to begin with - could have exhibited an adult version of the mother fixation. He'd only have to say "She's all I ever had in the universe," and the audience would believe that he'd feel compelled to act in her defense. So why? Why create problems for yourself, holding your breath that audiences will believe this tyke is a pilot, etc, when you could fairly easily utilize a young adult in the role?