.... and they were/are probably quality pumps in a reasonably clean and well maintained system?Our first pump lasted 30 years. It had no issues when it was replaced at all, it was simply replaced because it was due and for a more efficient one, which likewise has run for the past 11 years with no issues at all.
Regardless .... I'd hate to try and count the number of pumps I have changed on systems that were either old, dirty or the pump was corroded/poor quality. The pumps were still running but they just didn't have the grunt any more to supply enough circulation to the system they may have happily run well for years.