Try legislating the consumption of less fat, beer, and cigarettes.
See: Mayor Bloomberg
Let's also tackled the elephant in the room: Old people. There's a lot of them now. Some are probably related to all of us. We don't want to see them die. We pay out the ass for it. It's a problem that has no easy solution and frankly, has ethical considerations conflicting with what's possible in a financial sense if you're of the opinion that we simply don't have the money for all of this.