DAYTON, Ohio The world's longest-surviving conjoined twins died July 4 at the age of 68. In 2014, the brothers earned the distinction of being the world's oldest set of conjoined twins shortly before their 63rd birthday. WHIO reported that the two died in hospice care in Dayton, their brother Jim said. The brothers retired from entertaining in 1991, and lived alone until 2010 when health problems prompted them to move in with family members. The Dayton community raised funds and helped renovate their new home to allow the brothers to navigate in a custom wheelchair, the Dayton Daily News reported.