I expect pods are a bit more effective than that, except possibly in the case of insta-death. Generally someone would eject once their ship starts going critical, unless it all happens just to fast.
Once someone is ejected, they'll likely live. Maybe as a prisoner, but I think relatively few factions would just go and blow up an enemy pod. They've already won, the enemy is defeated and helpless, anything more is just cold blooded murder. Taking them captive for interrogation/incarceration/ransom is more likely, or slavery in the case of certain factions (Outcasts).
But that's neither here nor there, I would hazard a guess based on no actual information that less that 1% if the total human population of Sirius engages in regular spaceflight, and many of those don't engage in high-risk spaceflight (combat, etc.).
I think an average age of 100 or so for middle-class Sirius citizens with decent healthcare seems pretty reasonable. High-risk jobs or dangerous activities would likely reduce that a bit.
