The fans of the "Walking Dead" series sometimes demonstrate no less creativity than the TV show's scenarios, putting forward the most incredible theories. Of course, as the franchise develops, many of them are false, but one long-standing hypothesis remains capable to this day: Rick Gilims is immortal.
This amazing theory is based on two assumptions. The first is that Rica is immunity to a zombie virus. In part, this factor has lost its relevance, because in the comics "The Walking Dead" this assumption is refuted, but it has not yet come to this thing. It is possible that this topic will be worked out in the upcoming filmmaker led by Andrew Lincoln. Maybe the blood of Rick will be the key to finding an antidote from a deadly virus? While there is no answer.
The second assumption is reduced to the fact that the root cause of the zombie apocalypse in the "Walking Deadians" was precisely. Obviously, the infection was the consequence of an unsuccessful scientific experiment, which would seem to be inside out, turning almost the entire population of land in carnivorous monsters.
Nevertheless, in the case of some people, the experiment could be successful, giving them invulnerability. According to this theory, Rick is just belonging to this unique minority of immortal - despite the mass of almost fatal injuries, he still remains alive. However, Rick's long-life can be explained by the fact that he simply is a franchise protagonist, which is not profitable to kill the creators of the "walking dead".