How many other elephants did these elephants see in those 20+ years? It wouldn’t surprise me if that was fewer than 100. How many did they spend a few weeks or more with? It wouldn’t surprise me if that were less than 20.

There also, AFAIK, isn’t evidence they remember _all_ other elephants they’ve shared time with for at least few weeks (I certainly do not rule that out, either, given the low number they likely will meet in their life)