I tend to retire my machines to less demanding or suitable tasks. A Mac Pro 2006 (with a Cinema Display from 2000) is still going strong as a studio music computer running Logic Pro X (essentially a Hackintosh on Mac hardware, as Apple stopped supporting them). A MacBook from 2005 drives a TV with streaming video (although it needs retiring now).

It is harder with smartphones, but I have older phones being guest map and GPS devices.