Having cloned organs ready for transplant won't extend life as much as you think. A lot of this doesn't mean much if you can't replace a faulty circulatory system, which will inevitably cause organs to fail even if they are brand new.
Unfortunately, a circulatory system is practically impossible to replace. It would cost tens of millions of dollars and you'd have to already be in great shape to survive the very long recovery time. And then you do all this, only to die eventually, all the same.
I'm going by the assumption that, aside from genetic reasons, a circulatory system can in principle be kept in good shape through diet and exercise.
I think the first step is to focus on things that we don't have a solution for. Having good diet and exercise is a fairly comprehensive solution, no matter how hard it might be to maintain a lifelong strict regimen (as long as you're able to have such a regimen, your chances of the circulatory system going bad are slim to none).
In the case of organ failure, we don't even have anything other than reliance on organ availability from others.
Unfortunately, a circulatory system is practically impossible to replace. It would cost tens of millions of dollars and you'd have to already be in great shape to survive the very long recovery time. And then you do all this, only to die eventually, all the same.