Theoretical Lifespan of Humans Could Reach 194 Years, Study Suggests
A new mathematical model proposes that humans might live up to 194 years if most aging processes are eliminated, but DNA mutations remain a challenge.
Research indicates a potential human lifespan of 146 to 194 years.
Somatic mutations in DNA could limit longevity despite eliminating other aging factors.
The longest verified human lifespan is 122 years, highlighting the gap between theory and reality.
A recent study published in the journal npj Aging suggests that if major aging processes could be eliminated, humans might theoretically extend their lifespan to between 146 and 194 years. Conducted by researchers from Russia's Skolkovo Institute of Science and Technology and the Artificial Intelligence Research Institute, the study focuses on the impact of somatic mutations, which are DNA changes that occur in body cells over a person's lifetime.
Somatic mutations arise from errors in DNA replication or from damage that the body fails to repair. As individuals age, these mutations accumulate, potentially leading to diseases and declining tissue function. While aging is influenced by various factors, including cellular senescence and mitochondrial dysfunction, this research specifically examines how mutation-driven aging could affect human longevity.
The study identifies neurons in the brain and cardiomyocytes in the heart as critical factors that could limit lifespan. These cells have a limited ability to divide and replace themselves, which means that accumulating mutations could significantly impair their function. The researchers estimated that mutation-driven aging in neurons could yield a median lifespan of approximately 194 years, while heart muscle cells could allow for a median of around 208 years.
However, these figures are theoretical and do not imply that humans will soon live for nearly two centuries. The study's model excludes the possibility of organ transplantation and assumes a constant mortality rate typical of 30-year-olds. The findings highlight the complexities of aging and suggest that even with advancements in medicine, DNA damage may continue to pose a significant barrier to achieving longer lifespans.
The longest confirmed human lifespan recorded is 122 years, held by Jeanne Calment. The new study's estimates exceed this record, but they underscore the distinction between mathematical projections and real-world longevity. The research ultimately raises questions about the biological limits of human life, particularly regarding the role of DNA mutations in aging.
