This is certainly apparent on my mother's line, both sides of it, both she, her sister, and very many of their relatives lived into their late 90s. (Mum was over 99). There is at least one certain centenarian, and I think three, but the other two are as yet unproven. The trait has been apparent over many generations, her grandmother, my great grandmother was over 91 at her death, and many of her generation lived into their 90s.