A lot of biological research is inherently slow, because you have to wait to observe effects on slow processes in living things. Probably the only way to get rapid research progress on immortality is with vastly superior computer models running on vastly superior computers substituting for as much as possible of the slow observing what really goes on in humans research. Though there would probably still be a lot of slow observing what goes on in humans going on in the course of testing the computer models for accuracy. Anyway, making more powerful computers, and making better computer models of biochemistry, are already areas that get huge amounts of research spending. It seems likely that still more spending would encounter diminishing returns, such that no amount of concerted effort would further speed things up very dramatically (certainly not to the level you're asking for). Though you might get the impression around here that everyone who isn't a rationalist is a death lover, in fact most people want to live longer, including very rich people, and so a lot of money gets spent on pursuing that goal; lack of progress has a lot more to do with it being hard than with lack of effort.