The issue is that you will get the results on the subjects after your life is over or coming to end, unless it is the case that we could make life of a person currently >60 years old long which seems unlikely to me. So you would have to wait for 40 years before you know the results with good enough certainty.
Seems to me if you life is coming to an end that would increase the urgency. Remember money is not an object here it is basically just will to do it. The money is irrelevant. There is also the possiblity of increasing quality of life even if it doesn't save you.
I mean do nothing 0%, do something and any chance is better. The money doesn't matter.
