Accidents, war, suicide, starvation, "culling", fights, disease; there's plenty of ways people can die without age being a factor. Also, both sides suffer relatively low birth rates compared to general population. The war also kills inordinate amounts of young people --most die in their first couple battles, especially in Llanlleia. As Desunius noted, she can easily cut down nearly innumerable young, callow soliders in a day. They're basically cannon fodder. Llanlleians also tend to die more easily in battle because they lack the same regard for self-preservation. Young Syvorians often die as a result of starvation, directly or indirectly. They may simply starve, or be culled for food if times are hard enough. Mm, mm, good!
(Mmm, mm, Evil?)
As for exceptionally ancient people, well, generally they don't exist for a variety of reasons. In Llanlleia, the willingness for sacrifice often puts one's life at low measure, so they're willing to do things generally considered suicidal where a Syvorian wouldn't --as far as the war is concerned. A large portion of Llanlleians serve in the war at one point or another --everyone's required to train and drafts are common when traditional troop sources run low (and their population is already insufficient.) On a more everyday basis, there are a lot of older Llanlleians in areas where the war isn't a major concern, but once you reach a certain point it's really not tough to be killed accidentally, or finally succumb to disease. Every day is playing the odds that you're going to fall off a cliff or choke on a turnip or whatever. You need to be very dedicated to your survival to consistantly skirt the odds... at which point, you're running a serious risk of Evil. Nice catch-22.
In Syvoria, age tends to mean accumulated power and ability --hence becoming more impressive for both Llanlleians
and fellow Syvorians to off you. Also, murder is situationally legal in Syvoria
. More common factors keep the number of older individuals relatively low (I mean those over about 150-200) and from there, a decided incentive tends to emerge for those who might wish to kill them.
On the Lazaari (who now have an extra "a" in their name for added flavor!): they're... rather absent. Basically only the Zaa suspect/know that Lazaari exist, and they may or may not be right about that. The Zaa believe that they're boulders among pebbles, and that the Lazaari are mountains among boulders
. Sadly, if the Lazaari exist, they sure don't seem to care that the Zaa are so loyal... there's not a single Zaa who will honestly acknowledge they've seen one.