"He and Mrs. Carter go for walks, and they have a healthy diet all their lives," said Deanna Congileo, a spokeswoman for the Carter Center, to CNN.
"Both President and Mrs. Carter are determined to use their influence as long as possible to make the world a better place, and millions of the poorest in the world are grateful for their determination and their hearts," she added added.
The center is not planning any special celebration.
"But we at Carter Center are safe for him and grateful for his long service life, which has benefited millions of the world's poorest," the center said in a statement.
Winning a Nobel Prize With the Peace Prize and three separate Grammys, President Jimmy Carter can now count on his long and impressive resume as the oldest living US president.
NOTE: The headline and introduction of this article has been corrected to say that Carter will become the oldest living president ever on Friday.