Dude. Nobody has the slightest idea how to effectively treat "aging". The billionaires that engage in that fantasy might be pushing the state of the art a little bit, sure, but they do it from a starting position of absolute ignorance, and their efforts are mostly in vain.
It's like that old joke about a group of PMs that have "invented the general AI". Now all that's left to do is for some researchers and engineers to create it.
There are some ideas, in fact. They are not very well developed, though, because such research is very expensive, and even the very educated people on this side fiercely fighting the idea that extending people's life is a good thing.
Until the general public accepts the necessity of the age-related research, there won't be any effective mechanism for age reversion.
NIH yearly budget is 35B dollars. Half of that they spend on cancer research, the other half divides between the other diseases. Age research is a tiny fraction of this budget.
Until NIH spends at least 1/3 of their annual budget on fighting aging, there won't be any significant progress.
It's like that old joke about a group of PMs that have "invented the general AI". Now all that's left to do is for some researchers and engineers to create it.