The lifespan can be increased to approximately 120 years before some major genetic alteration in humans is necessary to extend life.

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Some scientists believe that the maximum human lifespan has already been reached at around 115 years old. However, with advancements in medical technology and improvements in lifestyle factors, some individuals may be able to surpass this age. Without major genetic alterations, it is unlikely that human lifespan could be significantly extended beyond 120 years.

The Lifespan Can Be Increased to Approximately 120 Years Before