There might be only one American who knows exactly what 16-year-old Quincy Wilson will be feeling as a youngster sprinting on the sport’s biggest stage.

Wilson’s rapid ascent from Maryland prodigy to Olympic contender has tapped the memory bank of 70-year-old Esther Stroy Harper, who was just 15 when she ran the 400 meters for the U.S. in Mexico City in 1968.

“Oh, yes, this has brought back big memories,” Stroy Harper told NBC News recently. “Every time I see a youngster like him…