We have isolated proteins that regenerate heart tissue, we know some of the proteins we need to make to clean up the plaque that causes alzheimers and we ever have cures for many other diseases. The biggest problem we have is one of production since some of these proteins are just very hard to make. I have made some advances in the field that will save a few tens of thousands of people ever year right now and I am starting more advanced education to help save millions.
I don't like the idea of living with a failing body but that choice is only temporary. There is really no reason we can't keep you in near perfect shape until an accident gets you. We are also getting better at neural interfacing. I full expect to rid myself of all biological components except my brain and put it in a robot body until we develop the technology to upgrade the brain also.
There are too many interesting problems in the world to want to die.