That happened to one of my games today, i had one villager that was oooohhhh so close to elder, just a teeny bit of building to get left, and when i opened it up today she, and and after doing the math another, were missing and there are no grave markers at all for them, she was old, so it wouldnt have suprised me if she had passed, but the other guy was like 20 somthing, the event i got today was the flash flood, and unless LDW wants to tell us that villagers will be washed away LOL, then they just dissapeared, i checked the save game files and there is no mention of them at all.