They are 76 years old. And from the very beginning, Darline Dietz and Doris Reifschneider say life as a twin has been something special.
"We were so much alike that our father couldn't tell us apart," said Doris.
"So if he wanted one of us he would just say, 'hey you.'"
It's something many twins can relate to. Each year members of the Nebraska State Twin Association gather to share their stories.
"We just enjoy being twins and celebrating with other twins," explained twins and event organizers, Julie Phillips and Janelle Schaefer.
"It's exciting. Even though we are both twins, we love coming to see all the other twins. It's fun," said Lisabeth John, who attended the event with her sister Lindsay Woodis.
The theme for this year's convention was "Scare Away Cancer." It's something that hits very close to home for Doris, who was diagnosed with breast cancer two years ago.
"I have yet to shed a tear because I have cancer. But my sister, my womb-mate, has done the crying for me," said Doris.
Proceeds from this year's event go to Relay For Life, to help people like Darline's other half Doris find a cure.
"If we live to be a hundred, I hope I live one day less so I never have to live without her," said Darline.