Theory:Doctor Who comic strip discontinuity and plot holes/The Time Witch


 * The Fourth Doctor gives his age as "743". Even taking into account the fact that he sometimes gets it a bit off, he knew that he was 748 when he regenerated, and had been around 750 in several adventures.
 * One of Four's defining features is he doesn't really know or care what age he is. Probably just pulled the number out of a figurative hat and thought "Eh, good enough."