Longevity Escape Velocity? Even if you had orders of magnitude more people working on medical research, it's not a given that prolonging life indefinitely is even possible.
Of course it's a given unless you want to invoke supernatural causes the human brain is a collection of cells with electro-chemical connections that if fully reconstructed either physically or virtually would necessarily need to represent the original person's brain. Therefore with sufficient intelligence it would be possible to engineer technology that would be able to do that reconstruction without even having to go to the atomic level, which we also have a near full understanding of already.
