How long is an iphone supposed to last?

If you have a 3G you know you can't download apps, music, even ring tones… Then how long is supposed to last an iphone?

I know people still using 3G and they download stuff all the time. Some apps are for latest hardware though… Not all. I used my iphone for 3 years and still no issues, but I'm upgrading because I want the newest hardware, newest battery, newest graphics, etc.

At most it must last 9 months but for me it won't last for day.

At least two iOS versions for app compatibility.

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