PLAINS, Ga. (AP) — Longtime friends, family and fans of Jimmy Carter milled around his hometown of Plains to celebrate his 100th birthday on Tuesday, the first time an American president has lived a full century and the latest milestone in a life that took the Depression-era farmer's son to the White House and across the world as a Nobel Peace Prize-winning humanitarian and advocate for democracy.

Living the last 19 months in home hospice care, the 39th president keeps defying expectations, just as he did through a remarkable rise from his family peanut farming and warehouse business to the world stage. The Democrat served one presidential term from 1977 to 1981 and then for four decades led The Carter Center, which he and his wife Rosalynn co-founded in 1982 to "wage peace, fight disease, and build hope."

"Not everybody gets 100 years on this earth, and when somebody does, and when they use that time to do so much good for so many people, it's worth celebrating," his grandson Jason Carter, chair of The Carter Center governing board, said in an interview.

"These last few months, 19 months, now that he's been in hospice, it's been a chance for our family to reflect," he continued, "and then for the rest of the country and the world to really reflect on him. That's been a really gratifying time."

James Earl Carter Jr. was born Oct. 1, 1924 in Plains, where he lives in the same one-story home he and Rosalynn built in the early 1960s, before his first election to the Georgia state Senate. The former first lady, also from Plains, died last November at 96.

About 25 family members filled his home Tuesday, enjoying cupcakes on the front lawn while antique World War II planes flew over in his honor. At night, they planned to gather around the TV to watch the vice-presidential debate.

Chip Carter said his father's next goal is to make it to Election Day.

"He's plugged in," Carter said in an interview. "I asked him two months ago if he was trying to live to be 100, and he said, No, I'm trying to live to vote for Kamala Harris."

Chip Carter sat in the front row of a naturalization ceremony held annually on his father's birthday for 100 new citizens at Plains High School, which his father attended. The building is now a museum.

Jill Stuckey, superintendent of the Jimmy Carter National Historic Park, recalled that a teacher once told Carter's class that one of the students would be president someday. She said Carter "took it heart."

"One thing I've learned is to never underestimate Jimmy Carter, because if you do, he will prove you wrong," Stuckey said.

President Joe Biden, the first sitting senator to endorse Carter's 1976 campaign, praised his longtime friend for an "unwavering belief in the power of human goodness."

"You've always been a moral force for our nation and the world (and) a beloved friend to Jill and me and our family," the 81-year-old president said in a tribute video, recorded in front of Carter's White House portrait. Carter asked Biden to eulogize him at his state funeral when the time comes.

Georgia Gov. Brian Kemp declared Tuesday "Jimmy Carter Day" to recognize his legacy as the state's 76th governor. Other birthday events have included a musical gala in Atlanta with dozens of artists, airing Tuesday evening on Georgia Public Broadcasting, that has raised more than $1.2 million for The Carter Center. Townspeople in Plains planned another concert Tuesday evening.

And Habitat for Humanity volunteers are devoting this week to build 30 houses in his honor in St. Paul, Minnesota. The Carters served as ambassadors for the organization, hosted annual building projects into their 90s.

Minister Barbara Green and Deacon William Le Green of Americus came to Main Street in Plains to honor Carter, who helped build their Habitat for Humanity home in the early 2000s. Le Green recalled how Carter gave the couple hammers to keep, along with their keys.

"He didn't mind getting his hands dirty, or anything of the kind," Le Green said.

Jimmy Carter was last seen publicly nearly a year ago, visibly diminished and silent as he used a reclining wheelchair to attend his wife's two funeral services. Jason Carter said the family hadn't expected to enjoy his 100th birthday after she died. The former president's hospital bed had been set up so he could see and talk to his wife of 77 years in her final days and hours.

"We frankly didn't think he was going to go on much longer," Jason Carter said. "He's really given himself over to what he feels is God's plan. He knows he's not in charge. But in these last few months, especially, he has gotten a lot more engaged in world events, a lot more engaged in politics, a lot more, just engaged, emotionally, with all of us."

He said the centenarian president, born four years after women were granted the constitutional right to vote and four decades before Black women won ballot access, is eager to cast his 2024 presidential ballot for the Democrat who would be first woman, second Black person and first person of south Asian descent to reach the Oval Office.

"He, like a lot of us, was incredibly gratified by his friend Joe Biden's courageous choice to pass the torch," the younger Carter said. "You know, my grandfather and The Carter Center have observed more than 100 elections in 40 other countries, right? So, he knows how rare it is for somebody who's a sitting president to give up power in any context."

Early voting in Georgia begins Oct. 15, two weeks into Carter's 101st year.

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Barrow reported from Atlanta.