Guinness World Records certified two Japanese sisters as the world's oldest living identical twins on Respect for the Aged Day, a national holiday in Japan.

A North Carolina llama was officially declared the oldest in the world at the age of 27 years and 250 days old.

A giant panda has given birth to twins after more than a decade of trying to mate successfully, becoming the oldest known first-time panda mother.

A 19-year-old giant panda named Ying Ying has given birth to twins, becoming the oldest known first-time panda mom.

Ying Ying, 19, is the oldest first-time mom of the giant panda species to give birth to twins. (Ocean Park Hong Kong) The cubs are "very fragile" as newborns, especially the female.

A giant panda has given birth to twins after more than a decade of trying to mate successfully, becoming the oldest known first-time panda mother.

A giant panda has given birth to twins after more than a decade of trying to mate successfully, becoming the oldest known first-time panda mother.

A giant panda has given birth to Hong Kong’s first set of twin cubs, officials said, making her the world’s oldest first-time panda mother.

A giant panda has given birth to twins after more than a decade of trying to mate successfully, becoming the oldest known first-time panda mother.

A giant panda has given birth to twins after more than a decade of trying to mate successfully, becoming the oldest known first-time panda mother.

Hong Kong (CNN) — A giant panda has given birth to twins after more than a decade of trying to mate successfully, becoming the oldest known first-time panda mother.