Is there really an immortal body on earth?

There is no eternal life, strictly speaking, because everything is moving. You exist at this moment because you died at the last moment.

Ignore this small change and it may last longer. The eternal life of man is, in the final analysis, the eternal life of thought.

Most likely, biotechnology can be used to prevent people from aging, but even with this technology, the government will keep it a secret. If natural and man-made disasters (car accidents, shootings and even supernova explosions) are avoided, the spirit based on the body can last longer.

Computer technology can be used to completely scan a person's thoughts and memories into a robot, which can also be said to be eternal life. However, because the information in the computer can be transmitted and stored quickly, the thinking in the machine may cause confusion and self-destruction when it quickly accepts new knowledge.

You can use the future human freezing technology (if quick freezing doesn't destroy the cell structure), so you can't even think about it, but fortunately, there is still a chance to make further changes in the future.