Alternative take. The 'haves' would get rid of the have nots because the have nots are the biggest risk to their continued existence. And in one fell stroke also solve all those issues. Why bother will billions when a few million slaves will do?
Seriously though, this is all just wishful thinking, it isn't going to happen. You, like all those before you will die, probably at an age well below 100. And by that time you'll be cynical, old and tired, if you're very lucky not even disease ridden.
The biggest medical breakthrough in the field of life extension was doctors washing their hands and a couple of vaccines.
You want some life extension advice, here it is free of charge: get rid of your car, buy a bicycle. Eat healthy. Go live in the countryside rather than in a city. If you smoke stop doing that. If you drink alcohol, stop doing that.
There, added at least a decade to your life which is more than de Grey will ever do for you.
You're welcome.