Pretty interesting to read if you like to be knowledgeable about such things:
This is a list of the oldest, still surviving, towns and cities in the world. There are some points of contention here and care should be taken when using the list below. The cities have been listed because either the archaeological record has shown, or documents have supported the claim, that the settlement was in existence at the time given. However, presence here should in no way indicate that there is total consensus over the date the city was founded — differences in opinion can result from different definitions of “city” (usually relating to the population size) as well as “continuously inhabited” (relating to changing population size; changes in location and changes in name). Additionally, where an approximate date has been given, the date was treated as the lower end of the estimate for the purposes of the table.