Years of general decline in health, culminating in confinement to a "nursing home" where all you can do is suffer for even more years while waiting to die, all the while watching all your life earnings being consumed by the medical system so that all your attempts at building an inheritance for your family wind up being for nothing, until further progression of your general decline robs you of even that awareness, reducing your existence to nothing but pain interrupted by periods of awareness just long enough to realize that all you do is suffer and incur debt, followed at long last by death, broken, broke, and alone, from nothing in particular, by which point everyone who knew you will have become so weary of you from watching you do nothing but suffer that they can no longer find it in themselves to care about your passing.
Interestingly, such deaths are quite common.