I actually took this to be in reference to how she died and the spirit of Faith brought her back. "I never knew why the spirit kept me alive, when I should have died all those years ago. Now I do."
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Yes, but... gonna spoiler tag this
In any case... If 40s is NOT older in Thedas (though it wouldn't surprise me if people mostly live around 65-70 in Thedas, it would make sense for the setting and how hard it seems to be to scrape by, unless you're very fortunate) then why is Solas going on about "kids these days" unless in jest?
Yes, 40s is old enough to have adult children, and yes, people in Thedas may even have children at younger ages (16-18) than we generally accept in the modern world but older than we would have expected in medieval times (or so I suspect). But when I think of someone going on about "kids these days," I tend to expect someone older than that. Late 50s, early 60s at least.
I'm somewhere in the under-40 range (not going to specify, but old enough that 40 is not "old" to me, even if it's above my personal age range preference at the present time), though, and I can sometimes talk about kids these days... if they're elementary school students or so. So I guess it's feasible, it just doesn't seem like something a person in Solas's age range would do... unless he's considerably older than he's "supposed" to be.
'Course... he could still be a standard run of the mill apostate.