If war doesn't destroy us, and if the money system stands (even though it might change)...
Right now they are doing age-reversing tests on dogs. If the tests work out as planned, they will start on people in 2022.
They don't say how long it will take for them to prove the tests to be successful or not, but consider that it might only be 8 years (2030) before they start administering their processes publicly. This means that by 100 years from now, the population of the world will have increased far more rapidly than if they hadn't developed this age reversal.
We will have multiple billions more in population numbers. We will have no choice but to colonize Northern Canada, Siberia, the Sahara and other deserts, and even the surface of the ocean.
With the large population of long-lived scientists, they will surely figure out ways to go to the stars and populate different planets so that we can move people off the earth, and reduce the population thereby. The basics for this have already been developed. See
https://newatlas.com/orion-project-atom-bomb-spaceship/49454/.