We don't? There are computer systems running since the seventies in areas like banking and aerospace, why wouldn't they last another fifty years? Most of my pr

We don't? There are computer systems running since the seventies in areas like banking and aerospace, why wouldn't they last another fifty years? Most of my professional work over the last fifteen years has been on applications that were ten years or older when I was recruited. Currently I do work in public sector digital archiving, where it's common to retire systems that are still being updated and have been going since the nineties. This kind of long term storage aims for century or more.