What will happen to the earth when humans discover the gene for immortality?

More than 99% of human beings do not die naturally, but die from diseases or accidents. If a gene for immortality is discovered, humans will still die due to disease or accidents (no change). If a gene for immortality is found, Genes that can resist diseases (excluding 35% of accidental deaths) can only be controlled by law at that time, but I think that humans at that time will not prohibit the use of such genes, nor will they eliminate the weak because of resource issues (The government may send someone to manage this matter within 3 months of pregnancy). In short, everything is borne by the law.

In other words, for example, there are 200 people on the earth, 35 people died due to accidents in the first stage of the earth, and the remaining 165 people (excluding reasons such as not liking children or laws, etc.) were (created) by 150 people 75 People, that is to say, there are 1/8 more people (225 people) than before. I believe that this growth rate can be controlled. . .

(Completely a personal guess, for reference only) - -!