Have you ever seen the show called 2057? It aired on Discovery Channel. They do say,,while providing good evidence,,that in about 50 years we will have the ability to make artificial organs, thus prolonging everyone's lives. It will probably be possible to create an artificial brain, the problem is, how do you pass all the information from a dying/dead brain to an artificial one.
If they can find a solution to THAT,,then immortaility is very well going to be possible in the near future.