It gets a bit tricky with Walt, because the actor, Malcolm David Kelley, is growing and changing so much in real life, but the story moves at a much slower pace, so Walt will look much older than he is supposed to be.
Yes, I believe they will return, Michael, at least. Harold Perrineau (Michael), was in negotiations to return for the season 3 finale, but it looks like that fell through. We will see him in season 4, though.
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