Yeah until they die because the not changeable SSDs has reached their cycles.
I see many old ThinkPads still humming in the university library, but not many old macs.
And how do you know you're not seeing many old MacBooks? The MBA was launched over a decade and a half ago and it still looks almost identical to a casual observer.
There are huge noticeable differences between a 10 year MBA and a recent one
Also the M1 has only been around for a little over 3 years. They can't be dying after 4 years because they're not that old.
Where are you getting all this misinformation from? And why are you motivated to be repeating it?
And as long as you have the Silver color option, a MacBook Air from 2023 looks very much like a MacBook Air from 2014 if you're not stopping and looking closely at it.
If you have one of the colored ones, those date back to 2018 with, again, a very similar design to today's.