What is referred to by '40 40 at wimbledon'?

Based on the clue '4 years after graduating from duke this sophies ch...', what is the answer? Based on the clue '4 years after the red badge of courage he wrote th...', what is the answer? Based on the clue '4 years before the hindenburg a us navy one of the...', what is the answer? Based on the clue '4 years before writing little dorrit he wrote his ...', what is the answer? Based on the clue '40 bc cleopatra dont think again', what is the answer? What is referred to by '40 bc jimmu'? Based on the clue '40 kids ages 8 15 tried to live without their pare...', what is the answer? Based on the clue '40 years after a famous incident he was awarded a ...', what is the answer?