I have lost my BF, 53, to breast cancer, and three other acquaintances, also to cancer in aged between 40-50. All of them left children, the youngest being 15.
These is no way any society can expect most human beings, to be fit or well enough to work until 71. If 1:2 is now the ratio of people who will get cancer in their lifetime, not to mention any other disease such as Alzheimer's, heart disease or a stroke, that makes for a pretty dire scenario for hoping to remain healthy after 60.
I don't care about myself as I'm happily semi retired but
considering there is almost zero joy in being a young person being able to afford the most basic and dignified of security and aspirations, ie a house, I shall ensure my children are saving to retire around 50-55 - and that's only if they choose to stay in the UK (both in professions where they could work worldwide).