Over twenty years ago. Veritably ancient. Perhaps the reason why people are more troubled by the Waltons (family net worth: $238B) than Gates ($132B) is that

Over twenty years ago. Veritably ancient. Perhaps the reason why people are more troubled by the Waltons (family net worth: $238B) than Gates ($132B) is that the Walton wealth is multi-generational and Gates' is not (so far). Though I think that as long as the Waltons keep spreading their money out among an every increasing number of descendants, it mostly takes care of itself.