I don't see why death is inevitable. Life is nothing more than information and information will last beyond the heat-death of the universe itself. Doing anything useful with those facts is beyond modern science, although anyone in their 30s or younger may well live to see the day when full-body regeneration and/or full brain simulations are a reality. The longest a human can live biologically is about 120 years and Moore's Law dictates that it won't take 90 years to achieve the necessary sophistication.

Of course, that pre-supposes that humans are getting smarter at the same speed. Machines don't invent themselves. The last 20 years hasn't been good to education, which extends the longest possible time to 110 years from now. That's the longest. If it can be done, it will be by then.

We, as a species, need to let go of all "certainties" that may only be temporary possibilities.