What is the oldest laptop that can run an up-to-date, internet connected OS (i.e a museum device with the same OS from 1991 doesn't count). It doesn't have to have a fancy desktop, but it does have to support connectivity to the internet, and run all the latest security patches and updates.
This is different than the article because optimizing productivity isn't an objective, just how long the device can be updated before it becomes impossible to do so anymore, analogous to vintage car maintenance.