ATLANTA (NewsNation) — Former first lady Rosalynn Carter, the wife of 39th President Jimmy Carter, died Sunday at her home at the age of 96, according to a release from the Carter Center.

The former first lady was battling dementia as both she and President Carter received hospice care at their home in Plains, Georgia.

The Carters were married for 77 years and remained together in the same small town where they were born, married and that anchored Jimmy Carter’s victorious 1976 presidential campaign.

“Rosalynn was my equal partner in everything I ever accomplished,” President Carter said. “She gave me wise guidance and encouragement when I needed it. As long as Rosalynn was in the world, I always knew somebody loved and supported me.”

She is survived by her children — Jack, Chip, Jeff, and Amy — and 11 grandchildren and 14 great-grandchildren. A grandson died in 2015.

“Besides being a loving mother and extraordinary First Lady, my mother was a great humanitarian in her own right,” said Chip Carter. “Her life of service and compassion was an example for all Americans. She will be sorely missed not only by our family but by the many people who have better mental health care and access to resources for caregiving today.”

The former first lady spent decades advocating public health policy.

Since her husband was Georgia governor in the early 1970s, she called for a more comprehensive American healthcare system treating mental health as integral to overall health and recognizing the importance of caregivers to the nation’s social and economic well-being.

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“Her incredible ability is to both look at a problem from the need for policy changes, and to think about the individual who lives next door or down the street and is struggling,” Jennifer Olsen, who leads the Rosalynn Carter Institute told the Associated Press.

Olsen noted the former first lady has pushed multiple U.S. administrations to establish an office within the Department of Health and Human Services dedicated exclusively to advocating for caregivers.

The office develops specific programs to aid caregivers and analyzes all public policy — from tax provisions to labor rules and regulations — through the vantage point of people caring for loved ones.

In recent months the couple’s four children, and many grandchildren and great-grandchildren, had been a near-constant presence at the Plains compound.

Close friends and some extended family also have visited, as the couple seems to defy their age and conditions, even attending the Plains’ Independence Day fireworks display in July.

Rosalynn Carter was the second-oldest presidential spouse in U.S. history.

Bess Truman died at 97 in 1982, the year after the Carters left the White House. The Carters were the longest-married first couple in history, having marked their 77th wedding anniversary in July.

The Associated Press contributed to this report.