Usually at most 3 years, I think, and probably more severe for non-opensource or non-free products (including hardware drivers and software storage formats).
Breaking backward compatibility after every major updates is another thing, like what Microsoft Office did. Not sure if online, subscription-based softwares will exacerbate the problems.
The only reason I can be sure of an 8-year-old laptop, is because of Linux.
I also find later that my 3-year-old MacBook Air hardwares cannot be replaced or upgraded -- it is fixed to the mainboard.
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A Quoran actually answered good.
quora.com/Why-do-any-hardware-and-...
en.wikipedia.org/wiki/Planned_obso...
In short, unless there is a social movement...