Apple's iPhone 5 is more than eight months old, and speculation over Apple's next-generation iPhone, dubbed iPhone 5S or iPhone 6, is on the rise. Here, we ask whether or not it is worth buying an iPhone 5 now or waiting until Apple launches its new iPhone later this year.Related StoriesNew iPad to be available in gold finishiPad 5 rumours: Apple's new iPad will be 33% lghter, launching SeptemberShould I bu