IME I tend to get a new MacBook every five years or so just because I like new hardware, but none of my old MacBooks were anywhere near end of life after 5 years. One I gave to a relative was in use for around 13 years until it failed (but it was really abused so I actually think it was a good run).

My wife’s MacBook Air is 12 years old and my wife doesn’t want a new one (though it would drive me crazy). No issues yet, though obviously battery is not what it once was.

Anyway, I think MacBooks last much longer than 5 years if you can control your new hardware envy.

My gf uses my ~10yo air and it is amazing she can stand it.

Just website inefficiency creep has made older devices obsolete, I think it has around 4gb of Ram which Chrome can chew through with a few tabs open.