Operational lifespan of 60's and 70's trucks

So much has changed that leads (or led until supply problems obliged owners to retain older vehicles to get the job done) modern fleets to be renewed rather more regularly than before. Technical advances, pollution rules, the many attractive financing options of the vehicles, all lead to a change of vehicle sooner than in the past.

The downside of all this is that whereas older vehicles would finish their life in Europe and then move on for another in Africa or South America that is much less likely due to their technical complexity. Thus their resale value is reduced. I used to see many older trucks in Africa a decade ago. Now I see modern Chinese built vehicles built with local “maintenance” and repair in mind.