Former First Lady Rosalynn Carter has been diagnosed with dementia, the Carter Center announced on Tuesday.

Rosalynn Carter, wife to former President Jimmy Carter, will continue to "live happily at home with her husband, enjoying spring in Plains and visits with loved ones." The family announced in February that President Carter would spend "his remaining time" in hospice care.

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President Carter and Rosalynn Carter have been married for more than 75 years, making them the longest-married presidential couple in American history.

Rosalynn turned 95 years old in August, and she is the second-longest-lived former first lady in United States history.

"Mrs. Carter has been the nation’s leading mental health advocate for much of her life. First in the Georgia Governor’s Mansion, then in the White House, and later at The Carter Center, she urged improved access to care and decreased stigma about issues surrounding mental health," the Carter family wrote in a statement.

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"Mrs. Carter often noted that there are only four kinds of people in this world: those who have been caregivers; those who are currently caregivers, those who will be caregivers, and those who will need caregivers. The universality of caregiving is clear in our family, and we are experiencing the joy and the challenges of this journey," the statement continued.

The family said that they do not expect to release further comments on Rosalynn Carter's condition.