Very little research currently goes into attacking aging directly - as opposed to handling things that are in no small part downstream from aging, such as heart disease. A big reason for poor "longevity gains" is lack of trying.
You can't rely on billionaires to fix everything for you. The kind of research effort that would be required to make meaningful progress against aging would likely demand hundreds of billions, spent across decades. Few billionaires have the pockets deep enough to bankroll something like this, or the long term vision.
Getting aging recognized as a disease and a therapeutic target, and getting the initial effort on the scale of Human Genome Project would be a good starting point though.
If there was understanding that a drug "against aging" is desirable by the healthcare systems and can get approved, Big Pharma would have a reason to try - as opposed to developing drugs for other things and hopefully stumbling on something that makes progress against aging by an accident.
The actual problem is that you would have to do selective breeding and genetic modification of humans the same way we do it with plants and animals. It is primarily an ethical problem.
Sure, it would be nigh impossible to do something like cram "genetic resistance to cancer" into a grown adult with current day tech, but there are other surfaces to attack in longevity.