Who Are the Oldest Living Conjoined Twins
The oldest living conjoined twins in the world are Chang and Eng Bunker, who were born in 1811 and lived to ages 62 and 63 respectively. They were joined at the sternum by a band of cartilage and lived independently for most of their lives, dying in 1874. The longest-lived conjoined twins in modern medical records are Ronnie and Donnie Galyon, born in 1951, who lived to ages 68 and 68 before passing away in 2020. Their case is documented by medical institutions and widely cited in peer-reviewed literature on conjoined twin survival rates NCBI research on conjoined twin outcomes.
Current data from the Conjoined Twins Registry and major medical centers shows that survival past age 50 is extremely rare, with fewer than a dozen documented cases worldwide. The majority of conjoined twins are stillborn or die within the first 24 hours of life, with overall survival rates estimated at 5% to 25% depending on the type of fusion and organ sharing Mayo Clinic overview of conjoined twins. The oldest currently living pair, if any, remains under continuous medical observation at specialized centers.
Types of Conjunction and Survival Factors
Thoracopagus and Omphalopagus Cases
Thoracopagus twins, joined at the chest and often sharing a heart, have the lowest survival rate, with fewer than 10% surviving past infancy. Omphalopagus twins, joined at the abdomen and typically sharing a liver, have a higher survival rate, with approximately 30% to 40% surviving to adulthood when separated surgically CDC data on birth defects and conjoined twins.
The type of conjunction determines surgical feasibility, with separation surgery success heavily dependent on shared organ systems, vascular connections, and the expertise of the surgical team. Modern separation procedures, pioneered at institutions like the Children's Hospital of Philadelphia, have achieved survival rates above 70% for selected cases where vital organs are not shared CHOP conjoined twins program.
Medical Advances and Separation Outcomes
Key Surgical Milestones
The first successful separation of thoracopagus twins was performed in 1953 in Denver, Colorado, and since then over 300 separation surgeries have been documented globally. Advances in imaging, anesthesia, and critical care have increased the number of successful separations, with recent cases at hospitals like Great Ormond Street Hospital in London achieving full survival for both twins Great Ormond Street Hospital conjoined twins treatment.
Current research focuses on 3D-printed surgical models, shared blood vessel mapping, and regenerative medicine to improve outcomes for future conjoined twin pairs. The Conjoined Twins Registry at the University of Maryland continues to collect data on every documented case, providing critical information for surgical planning and long-term prognosis.