Jacoby is not the only teenager to have won gold for Team USA in Tokyo.
Anastasija Zolotic beat Russian Tatiana Minina in the the women's taekwondo 57kg final at the Makuhari Messe Hall on Sunday to earn the American gold in her first games.
In doing so, the 18-year-old Zolotic, who was born in Florida, became Team USA's first winner of the women's Olympic gold.
"My eight-year-old self was running around the school yard saying I was going to be Olympic champion but she could never have imagined what this moment is like. It's unbelievable. It really hasn't sunk in yet." Zolotic said.