Former President Jimmy and former First Lady Rosalynn Carter marked their 77th wedding anniversary with a quiet Friday at their south Georgia home yesterday, extending their record as the longest-married first couple ever as both nonagenarians face significant health challenges.

The 39th president is 98 and has been in home hospice care since February. The former first lady is 95 and has dementia. The Carter family has not offered details of either Jimmy or Rosalynn Carter’s condition but has said they both have enjoyed time with each other and a stream of family members, along with occasional visits from close friends, in recent months.

“As we have looked back at their legacy, it has been really wonderful to see the outpouring of support and respect and love,” grandson Jason Carter said recently. “That word love is really the one that defines certainly their personal relationship, but also the way they approach this world.”

Jimmy and Rosalynn Carter have been on the American and international stage together for a half-century. What they described as “full partnership” began years earlier in the Carter family farm business before his political career and their decades of global humanitarian work since leaving the White House in 1981 and establishing The Carter Center the following year.