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Being an iPhone user myself, even I disagree with that.
The oldest iPhone safely capable of running iOS 6 is the iPhone 3GS; the iPhone 3 pretty much capped out on 5 and I'm not sure even the original iPhone could handle 4 very well. That said, the iPhone 4 I use is having no trouble with iOS 6 and may do pretty well with 7. So I will agree with the intent of your argument--probably offering between 4 and 5 years of usable life with the iPhone vs a likely maximum of 3 years with even the current round of Android devices.