I just recently watched "Oz", and the whole thing has me thinking about time dilation, for some reason. The opening of both movies seem to be in roughly the same time period, I'd say 1890 to 1910, with "Wizard of Oz" happening at the latter portion of the time frame. However, when Dorothy travel's to Oz, the Wizard is an old, wizened man. You'll also notice that Glinda seems to have aged only barely.
So my question is, does time in Oz affect humans differently from its natural inhabitants?