He's a magus, part of an Ex Miscellanea arachnamancer tradition (spider magic) that causes its members to have a difficult time extending their lifespans through Longevity Rituals. The magus in question didn't really have a choice about entering the tradition, of course; apprentices don't tend to get a say in this sort of thing. However, it's pretty much the worst possible drawback, as he was already cursed as a child with the Age Quickly Flaw. He only managed to not get aging points during his apprenticeship because his teacher made him a Longevity Ritual, which sucked, because said teacher only brought his Creo and Corpus scores to 5 and the tradition left the apprentice not even receiving the already-crappy LR as well as a normal person would. Long story short, he's 22 (effectively 44), and his last four aging rolls were entirely neutral, with the +3 from his LR and +1 from life quality in the covenant just cancelling out his penalty for how old he is.
And he certainly isn't a CrCo specialist himself. His master, somewhat sympathetic to his situation, taught him the tiniest bit of Creo and Corpus even though he hadn't planned to, but still, his Longevity Lab Total is only 17 in a usual Aura of 3, which with his tradition's Flaw provides a piddly +2 to his own aging rolls. Fortunately, his master's is still active (meaning he already has a Warping Score of 1...) so he has a bit of time to raise his Arts above their current respective 4 and 3.
Given all of this, and the fact that both Creo and Corpus books above level 5 around the covenant will be difficult to get ahold of... How much sooner ought this guy die than his fellow sodales who neither Age Quickly nor have Difficult Longevity Rituals? Based on averages, and including chances of hitting Final Twilight faster due to starting to gain Warping from LR much earlier than everyone else (though I figure he'll die of old age), how much sooner can he be expected to die? Note in advance, please base your assumptions on the fact that he won't be able to get a more skilled person to make him a Longevity Ritual, as while it's not impossible, it's also not a forgone conclusion that anybody will be willing to do such a thing for him, even with a vis payment (which could be hard enough to acquire even if it does work, as the saga might be low-vis). Thanks in advance for any help in estimations.
(I suppose my guess at this point is that, with the longevity ritual providing substantially less help, Age Quickly will do what it usually does, halving the average lifespan of the character compared to the average lifespan of other characters of his type... In this case, magi. Even if he manages to outdo the aging by pumping his Creo and Corpus scores and drinking several glasses of vis with it, he's also going to be around 20-30 Warping Points ahead of his sodales, meaning he'll start getting bad Twilights sooner and thus probably pass into Final Twilight 10-15 years earlier independent of other factors. So... Either 50-70 years past Gauntlet on average, or 100-110 past Gauntlet are my guesses, depending on which form of death manages to catch up to him first. Of course, my math skills are teh sux, so I may be way off).