Time is the dimension of consciousness and there is only now. What's done is not anymore and what will be isn't either. Even if we could live forever, how could we possibly know that we are in the process of living forever? Living forever now? Seems like apples and oranges.
The now of consciousness gets interrupted from time to time. For all intents, now is forever.
Just remember, if you die in your sleep, you won't know it until you wake up.