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If his computer is "fast and snappy" this year, and if his software (both OS and apps) are substantially similar 10 years from now to what he is using now, I think that his computer can easily be just as "fast and snappy" in 10 years as it is now.
Based on my experience with my 2012 Mini I would have to agree with Randy, except....
I upgraded from macOS 10.8 the OS the Mini came with to 10.11 and now to 10.14, six versions of the macOS
and
I filled the HDD up with over 400GB of date(on a 500GB drive)
and the Mini is still plenty fast for all the types of tasks the OP mentioned.
Windows PCs in the office we have to replace every 2-3 years because they slow down so much that it really affects connectivity, but I don't remember ever having replaced a Mac because its performance deteriorated significantly over time.