With the explosive growth in human lifespan, the population will undoubtedly experience a super-growth peak until the lifespans of the first batch of people who received gene optimization fluid come to an end. Considering a lifespan of 500 years and the age when people get married and have children, it's safe to estimate that the population will increase by at least tenfold.
So, the pressure is enormous. Just one Mars or one Earth is definitely not enough. By then, interstellar immigration will be inevitable. Finn Lewis still needs to find new technology to terraform other planets. Of course, it's not to say that the population will certainly increase so much because, with the increase in human lifespan, many people won't get married or have children too early.
