The Commonwealth Scientific and Industrial Research Organisation (CSIRO), the Australia's national science agency, says it has developed a blood test that has the potential help people live to 100 years.
The test, hailed as the first of its kind, essentially measures the level of damage to a person's DNA and can point to the likelihood of certain degenerative conditions, including cancer, developing later in life.
It will also allow doctors to determine an optimum combination and level of supplements or suggest changes to lifestyle and diet to best repair the DNA damage.
CSIRO principal scientist Michael Fenech said the evidence linking genome damage to degenerative diseases was mounting.
"As we age, our bodies produce poorer copies of DNA," he said.
"It is something like a photocopier that is running out of toner. If the toner is running low, the copies get worse.
"Optimal intake of key nutrients is required if cells in the body are to make accurate copies of DNA and produce healthy daughter cells."
Federal Minister for Ageing, Christopher Pyne, said the new blood test was a major step forward in preventative medicine.
"Preventing disease is an opportunity to reduce human suffering and the costs of degenerative diseases to the community," Pyne said.
"A growing body of scientific evidence has linked the degeneration of the human genome to an increased likelihood of degenerative diseases, such as cancer an Alzheimer's disease.