In a statement Friday morning, a spokeswoman for the Carter Center, the Atlanta-based nonprofit that Mr. Carter and his wife, Rosalynn, founded in 1982, said the former president took fewer long trips than he used to. But the spokeswoman, Deanna Congileo, said Mr. Carter “continues to remain engaged in the causes and activities that have marked his post-presidency.”

“He provides vision and assistance for Carter Center programs in global peace and health, participates in Habitat for Humanity builds one week a year, delivers Sunday school lessons in his hometown Plains, Ga., teaches at Emory University, and much more,” Ms. Congileo said.

“He and Mrs. Carter take walks, and they have followed a healthy diet for a lifetime,” she continued. “Both President and Mrs. Carter are determined to use their influence for as long as they can to make the world a better place. Their tireless resolve and heart have helped to improve life for millions of the world’s poorest people.”

Mr. Carter, a Democrat born on Oct. 1, 1924, promised to heal the country after Watergate only to last one term in office, his re-election chances hurt by a miserable economy and a hostage crisis. But while many in both parties consider Mr. Carter a disappointment as president, they generally view him as a model former president. Mr. Carter has enjoyed the longest post-presidency in American history after leaving the White House in 1981.

In addition to the activities listed by Ms. Congileo, Mr. Carter has intimately shared the details of his life story in a series of books; doled out hyper-specific advice about diet, exercise and the foundations of a meaningful life; and guided the Carter Center toward a series of public health achievements.