Humans may live up to 194 Years

How long can a human live?

No one knows the exact answer but scientists believe there is a natural limit to the human lifespan.

According to a study a person could possibly live as long as 194 years although reaching that age would be extremely rare.

Researchers say living forever is not possible. Even if science discovers new ways to slow aging the body cannot avoid the natural damage that builds up over time.

The study published in the journal Nature looked at how our DNA and genes change throughout life.

Scientists found that many genetic changes are harmless but some damage cells and reduce how well they work.

Over time this damage increases the risk of age related diseases.

The researchers explained that these genetic changes cannot be completely prevented.  They happen naturally when cells divide and can also be caused by viruses certain chemicals and ultraviolet (UV) rays from sunlight.

To estimate the maximum human lifespan the team created a scientific model that included reversible signs of aging while keeping permanent genetic changes in place.

The results suggested that even if future technology slows the aging process the longest a human could live would likely be between 146 and 194 years.

Scientists also noted that some organs such as the skin and liver regularly replace old cells helping repair some damage.

However the heart and brain do not replace most of their cells making genetic damage in these organs much harder to reverse.

The researchers stressed that genetic changes are not always harmful but as they build up over time they may gradually shorten a person’s lifespan.

They also believe that other biological processes may affect aging and more research is needed to better understand them.

At present the longest confirmed human lifespan belongs to Jeanne Calment of France who died in 1997 at the age of 122 years making her the oldest verified person in recorded history.