The writer of the Book of Judges (whom some believe was Samuel), in Judges 12.8–15 listed a few judges, of whom he did not say much. Of Abdon, the writer said,
After him, Abdon the son of Hillel the Pirathonite judged Israel. He had forty sons and thirty grandsons, who rode on seventy young donkeys. He judged Israel eight years (Judges 12.13–14).
What little the Bible says of this judge might make us think that the one thing it does say of him, that he had forty sons and thirty grandsons, and they all rode seventy young donkeys, has some kind of significance. If it does, I do not see what it is.
In my opinion, the Bible merely shows in another way, other than stating the number of years this man lived, that he was able to have forty sons, and he lived long enough to see his thirty grandsons ride donkeys, which also shows that they all lived long enough for this to happen. He does not appear to have lost any family during his lifetime. The Lord blessed him.