It certainly would have been easier if I went by the incorporation date for these cities, but from what I read on Irvine's Wikipedia page was that Irvine was an agglomeration of towns, the oldest of which was a town called Murphy which was established sometime between 1888 and 1914, due to the uncertainty on the exact date I decided to not include it whatsoever, although I could see an argument for it
https://en.wikipedia.org/wiki/Irvine,_California