Three sisters above age 100 are recognised by GWR as world's longest-living trio of sisters with combined age of 316 Three Brazilian sisters with a combined age of 316 have been named by Guinness World Records ​as the oldest living trio of siblings in the world. Researchers are now studying the sisters to find ‌out the secret to longevity. The DNA Longevo Project, a study led by scientist Mayana Zatz from the University of Sao Paulo, aims to investigate the biological factors behind aging. The sisters, Zulina de Deus Nunes, 103, Zoraide de ​Deus Mota, 104, and Levita de Deus Nunes, 109, who live in Rio de Janeiro, were ​identified through LongeviQuest, a global organization that verifies longevity records and partners with Guinness World Records. The three sisters credit their longevity to a healthy diet and an active lifestyle. Zulina ​recalled a childhood spent ​swimming and fishing in rivers. "Everything ⁠was fresh. We didn't have a refrigerator," she said. "Breastfeeding is incredibly important," Zoraide added. The sisters otherwise led fairly ordinary lives. Levita worked as a craftswoman and ​later at a television network. Zoraide worked as a nurse and raised five ​children, while ⁠Zulina, a stay-at-home mom, raised six. Levita looks back on her life without regrets. She said: "I had a good childhood and adolescence. I can't complain." Findings from the three sisters' case could help scientists better understand why some people remain ​physically and cognitively resilient at exceptionally advanced ages. "When sisters reach that age, ‌there ⁠is clearly a strong genetic component," said Ben Meyers, CEO of LongeviQuest. "But because they live near each other, they also have a support network, with family able to help when needed. There is definitely a community aspect as well." Researchers will compare nonagenarians and centenarians with people who ​have developed frailty, cognitive decline or chronic diseases, seeking traits linked to longevity.Credit @reuters