According to our current understanding of physics, time appears to be a unidirectional phenomenon that flows forward, from the past to the future. This concept is commonly known as the arrow of time. While there are certain physical processes that appear to be time-reversible at the microscopic level, such as the behavior of individual particles, the overall macroscopic behavior of the universe indicates a clear direction of time.
Reversing the flow of time, as portrayed in some science fiction scenarios, is not supported by scientific evidence or theories at present. It is important to distinguish between the scientific understanding of time and the speculative possibilities often explored in fictional works.
If it were possible to reverse time, it would introduce numerous philosophical and physical challenges. It would require not only reversing the direction of all physical processes but also maintaining consistency and coherence throughout the universe. The implications and consequences of such a reversal would be far-reaching and difficult to comprehend.
As for the idea of living forever by reversing time and reliving all those years in reverse order, it is a concept that falls within the realm of speculation and imagination. It is not supported by scientific evidence or our current understanding of the nature of time.
It's important to approach such ideas with a critical and discerning mindset, recognizing the distinction between scientific concepts and hypothetical scenarios depicted in fiction.