I can't say I've noticed any difference. In fact, if anything, my earliest villagers tend to live longer than their descendants. The ones who die first tend on average to be in the late 70s or early 80s, whereas the later deaths seem to at be around 72-76. I generally don't get L3 Nature until the last thing, by which time several elderly villagers will have died.

Perhaps the hard life they have to lead makes the earlier villagers more long-lived?