[ He gives a one-shouldered shrug. His face is carefully devoid of expression but Emet-Selch seems tense. ]

All the peoples of our star were the same long, long ago. But not any longer, and never will be again. 'Tis quite a stroke of fortune, really, that I am around to help your little lordling with his unwanted passenger.

But yes - I've lived for almost fifteen millennia. As far as I can tell, the durability of my people's souls and our physical aether allows for indefinite life.