Back in the day I remember the Tau being noted as relatively short-lived, unlike Imperials who have access to rejuvenat treatments and cybernetics and the like.
Commander Farsight was a noted exception, causing speculation about demonic possession, Necron manipulation, timey-wimey stuff, or a dynasty of commanders using the same monicker.
But now quite a lot of time has passed in ye olde 40k into 8th Edition, which makes me ask: is it weird that Shadowsun is still alive? How old would she be?