If I can live forever. Will it be caught by the state to slice and study.

Your idea of slicing western medicine is too strong. A fake master in the 1980s, a 100-meter trauma victim, the top scholar in Tsinghua University, and the person with the highest IQ in the world: William Alfred Quaneton (IQ 400) has not been sliced yet. If you slice, you get nothing but heart, liver, spleen, lung and kidney.

If you really live forever, it is estimated that it will be studied, but it will not be sliced. At first, I will ask you (diet, medical care, the medicine your mother used when she was pregnant, everything your father did during that time, even the diet of your brothers and sisters, why didn't you live forever, and so on. It is estimated that you will lose some freedom, but you will definitely be protected, monitored, observed and never allowed to immigrate.