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I doubt there will ever be mass migrations off-planet. A far more likely scenario would be a few colonists populate off-planet with their descendants.

I wouldn't leave the Earth, as the Earth is a paradise. I was just out today, and the air smells sweet with the lowered pollution and the cherry blossoms out.

> Earth is a paradise

That will surely change if everyone keeps living forever and you get 100 billion people on it.

100 billion wouldn't be bad. We already have 7.53 billion and TONS of open spaces.

Well, for that exact reason immortality has to come with strings attached, in other words, you can have the eternal youth pill but you get your tubes tied. We would have to take population a bit more seriously and set a target of, say, 2 billion humans then implement policies that make the population tend towards that level.

Not to mention family reunions would get weird when you are biologically exactly the same age as your great grandfather.