No special term was felt to be needed to describe the condition that was so common for most of the period of development of the English language.

Huh?

What was "so common" throughout the history of the English language that explains why there is no word in english to describe parents who have survived their offspring.

Was it more likely a hundred or two hundred years ago that children would predecease their parents? And, if it was more likely, why would that be a reason not to have an english word describing the parents who survive their child?

If it is more likely today that a child will predecease their parents than in the past, why would that be a reason not to have an english word describing the parents who survive their child? New words appear in the language every day to describe things that previously went unnoticed or, at least, unnamed. [Tornadoes have been around forever, but how long has "tornadic" been around, I wonder?]

I just don't get it, Faldage. Can you make any sense out of what you have just written?