Theory:Doctor Who television discontinuity and plot holes/A Christmas Carol


 * How can Abigail's family not age, yet Kazran does?
 * By the the year 4000, it can be assumed that longevity has been extended somewhat, so Abigail's family- who live fairly normal and presumably not-too-stressful lives- wouldn't have appeared to age all the much, whereas Kazran lives a rather bitter and negative existance, has appeared to age far more greatly.