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...so back on the film, why is it that 'Saito' is so old in the deep level dream but 'Cobb' seems relatively young?
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Remember, in these dream worlds, the subconscience still ages (seen with Cobb and his wife in their shared dream) at an exponential rate compared to upper levels of shared dreams and reality (reality = 6 min, dream = hour, 2nd level = 10 hours, etc. etc).
I think because Saito entered that level x number of minutes before Cobb did (relative to the 3rd dream world time), it meant Saito spent much, much longer time there before Cobb even showed up.