Science has shown that the longer we can live, the more likely we will be taken out by cancer until the certainty becomes 100%.
The best we can do is keep our level of functionality at a higher point to a later age. Say, for example, having the same functionality as a 60 year old when you are 80 years old.
If the nanobots deal with cancer and what causes pain, augmenting your immune system, doing repairs, and doesn’t turn into a horror show, I wouldn’t mind sticking around to see what happens.