One of the biggest societal implications of people living longer is that the ratio of grandparents to grandchildren is now higher than its ever been before (including great-grandchildren as well, of course). And since grandparents are more healthy and 'younger' than grandparents have ever been, they can get involved in raising their grandchildren. This will free up parents. It could also be a way of generating income for older people. And it can shape societies and communities in new and interesting ways.