How long do androids last?

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http://androidforums.com – So i'm my first smartphone, off contract, So If I don't want to spend 400$ on a good off contract phone, I'm gonna have to buy on craigslist. One or two of the phones I am looking at are the nexus s, and the galaxy s2. There are some others, but that's just to mention one or two. So both of those phones are a year or two old. I'm just kind of worried, If I get a android thats already a year or two old, is it still going to last me as long as I need it to? I take good care of my stuff and probably wouldn't upgrade it for a few years. So if I buy a phone that sombody took decent care of, but h (General)