| The most useful health advice is to get cardio and strength training in and eat real foods. Everything else is a hyperoptimization. Some hyperoptimizations are marginally useful, some aren't actually useful at all. Humans were built to eat real food, and they were built to use their bodies. |
Also important to focus on getting strong as possible, in both bone and muscle, with some focus on fast twitch muscles. A lot of elderly death can be attribute to some sort of falls. Even if they survive the fall, it can be a road to a fast death.
Another thing not to neglect is to make sure you have movement patterns and that you focus on fortifying the body against injuries. Lifting extreme weight won't do you any good if you can't lift more, ditto for running.