*coughs and puts on his best HK Droid voice*
Logical speculation: Perhaps I should remind you that no Human can survive decaying of the flesh for 300 years, not even one so attuned in "the Force" as Lord Revan himself.
P.S. You know canonically he returned to the Light Side, and was named the Prodigal Knight. It's in all the comics and stuff and the game and stuffness.
If you wish peace, prepare for war.