What is the approximate lifespan of an iPhone 4?

What is the approximate amount of time that Apple will continue support for the iPhone 4? Is it reasonable that the device will remain non-obsolete for the next two years?

I have a 3GS, and there's still support for it. So it has been over 3 years since its release. So probably another year or 2 for the 4g.

The iPhone 3GS was released in 2009, and they're still releasing software updates for it, so I figure that the iPhone 4 will at least support iOS 6, and maybe iOS 7 eventually.

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