Jimmy Carter is 99 years old. Carter's grandson says exercise is the key to the former president's longevity.

Jimmy Carter is 99 years old. Carter's grandson says exercise is the key to the former president's longevity.

Former President Jimmy Carter and former first lady Rosalynn Carter in 2018.Scott Cunningham/Getty Images <ul> <li>Presidential grandson Jason Carter credits exercise to former President Jimmy Carte… [+3008 chars]

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