"We have a big family now," President Jimmy Carter told CNN's Jake Tapper in 2015, the week of his 69th wedding anniversary. "We have 22 grandchildren and great-grandchildren, 38 of us in all. So, we try to hold our family together and just enjoy the family life."

To make sure he gets to see all of those children, grandchildren, and great-grandchildren together as often as he can, Carter takes the entire brood on a family vacation each year between the Christmas and New Year's holidays, according to Country Living. As the 29th president told Jake Tapper about his wife and their large family: "[They are] the foundation for my entire enjoyment of life."

And what a life it has been indeed. Since leaving the presidency four decades ago, Carter has championed humanitarian efforts, and since 1984 has worked with Habitat for Humanity, which builds and renovates affordable homes for those in need.