If you live "for ever", I would say you will not have to die at a specific age, becouse you dont loose fitness with age. Even if you live "for ever" there could a big chance that you will die somehow anyway, by an accident for example.
Well, in the short term that seems to be the case. In the long term, accident rates can be reduced so low, and we can have such a sustainable progress in lowering accidental death rates, murder rates, suicide rates, and even politically-induced homicides (wars, terrorism, etc.), that we could make the claim that we'll probably never die. By "probably never", I mean that there will come a time, somewhere between 75 and 500 years from now, when most people alive will have better odds of living forever than of picking the winning number in a game of roullette (1 in 38). The 75 year figure assumes the Singularity is driven by a "Friendly" AI, and that the AI becomes powerful enough to prevent wars, terrorism, etc., and start massive emigration from earth. If the route of the Singularity is through computer-enhanced humans, then the war and terroism variables remain, so I've hedged my bet with the 500-year figure. I seriously doubt it'll take that long before we've reached immortality escape velocity. (I say "immortality" escape velocity, as opposed to "longevity" escape velocity, for good reason. I'll be discussing the math and the distinctions in my blog in the coming week or two, depending on how long it takes to draft the articles.)
In fact, probably less than a thousand years from now, if you're still alive, your odds of living forever are probably going to be better than 1 in 4. That includes all risks of death: disease, war, terrorism, murder, accidents, suicide, heat death, etc. (Note, we just don't know whether heat death will be a problem, so the best we can do is assign a probability to it, and this point, given how little we know, we must assume a rather high probability that we'll overcome heat death. But yes, if you're concerned, we can factor the probability of heat death into this 1 in 4 figure.)
The trick is living until then. And the first step to that is either a Friendly AI-driven Singularity, or accomplishment of some version of SENS/neoSENS in humans.