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You're wondering if there was any ancient food that allowed people to live to 800 or 900 years old. There wasn't.

I also don't think there was, its more of a scifi kind of musing.

Possibly a parallel in New Orleans? Anne Rice documents unusual individuals that can live well into the hundreds of years.

In some ancient cultures around that region, stating that someone was hundreds of years old was a sign of respect for their wisdom, authority, and line. The numbers weren't meant to be taken literally.