http://starwars.wikia.com/wiki/Ragnos
the details of his century-long reign are few, although his death marked the end of the high point of the Sith Empire, despite his reluctance to continue expansion. Immediately following his funeral, a schism erupted between the leaders of the Sith, and further events led to a major war with the Galactic Republic and, because the schism was never healed, ultimately the end of their interstellar empire.
His death resulted in the rise of another Sith Lord, Naga Sadow, shortly before the Great Hyperspace War. His spirit lingered in the Valley of the Dark Lords on Korriban, long after his death.
There is nothing about old age in that article and it was debated among Wookiepedia users whether to add it or not...it was vetoed because no canon source stated that's how he died...watch, I'll add 'he died of old age'...watch it get taken down
And do you have the internet version of selective hearing? I POSTED THE EMAILS IN THE OTHER TOPIC
You weren't around? Big deal! The Antediluvians, Nai and Escape WERE...the fact that Nai is accepting them means NOTHING to you? That guy is a vicious cynic and he attacks ANY source viciously until he sees proof, you REALLY think, since you cling to Nai's coattails so much I could put anything past him?