There is a big difference between how long you can make something work for and what's considered an acceptable life span. I'm willing to bet there are some old XT's around but why would you use it if there are machines which are faster and better. Sure it may save you replacement value, but you lose in performance and the cost difference will make a huge difference in time saved.
For anything business, you can replace every 2-3 years. If you salary sacrifice a laptop which is used for business, you can replace it every year at no additional cost to yourself (i.e. the second hand value of the laptop will be the same as the new value of a new laptop after salary sacrifice takes place) so why wouldn't you. Some of my consultants don't even believe me that this is possible, but if you do the sums, you'll see its true.
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