Well, if you combine these advances even with basic artificial habitat building at reasonable scale(Oneil cylinders, world houses, covered craters, cavern cities, asteroid habitats, etc.) you should be able to house all these people quite easily.
If all these long living people dont have to much new children (and might not be able to ? eq. if fully digitized or with body fully replaced with mechanical parts), it might be even easier.
I assume that it will require population control, because we will not be able to find enough habitable planets to keep up with the growth we have today. Basically a choice of "immortality" or procreation. This will also set a limit to how many colonies that are practical to create.
Also some may not accept the risks of travelling to other solar systems. Why risk dying "young" when you can expect to live for thousands of years?