My favourite example is the Hewlett Packard pocket calculator HP12C. It is built and available since 1981. Their longest selling product: https://en.wikipedia.org/wiki/HP-12CThere are several other examples of technologie from old technologie, still made in 2020, like the Piaggio Ape (This 3Wheel Light Truck Thing)
or the Lada Niva which was a long time build whit the same technic from the 1970thes, just whit some changes on the Exhaust Cleaning and i think an Airbag..
Or the "VW Beatle " which came from the 1930thes, and was build in Mexico until the 1980thes if i remember correctly....
The Pyra CPU is also not for ever, it is a basic option so the Handheld want be a Expensive Door Stopper until a better CPU Board is made..
Then it maybe Technik from the 2016 in 2025 ^^
And my HP15C (bought ca. 1985) is still alive and in use every now and then... For example, I did some calculations for mechanics or resistor values for the Pyra with it...
So the Pyra does not only use some older but still good technology, it was designed by using really ancient technology