at age 37. In shooting, there have been two figures of note whose accomplishments occurred in their sixties or later. Joshua Millner of Britain was 61 when he won his Olympic gold medal in Free rifle, 1,000 yards. Swedish marksman Oscar Swahn won two Olympic gold medals at the age of 60 and one at the age of 64. He won his last medal, silver, at 72 making him the oldest medalist. In squash, Jonah Barrington overcame alcoholism to later become a six times British Open Squash champion, and was regarded as one of the fittest men on the planet. In tennis, Angelique Kerber, Li Na, Stan Wawrinka, Francesca Schiavone, Flavia Pennetta, Jana Novotna, Goran Ivanišević and Andrés Gómez are famous late bloomers who won their first Grand Slam Singles titles after age 28. Association football Didier Drogba did not sign a professional contract with a club until the age of 21. It was not until the age of 26, when he joined Chelsea, that he showed his real talent as a world-class player. Drogba scored the equaliser, and then the winning penalty, in the 2012 UEFA Champions League final at the age of 34. The career of Junior Messias is one of the most incredible in football history. Messias come back to football in the early 2010s, starting at amateur level through :it:Unione Italiana Sport Per tutti. A few years later, he become a professional footballer and was even able to score on his debut, a match winning goal in the Champions League, at the age of 30 while he was on loan at AC Milan. Although he played a few matches for the U-16 and U-21 Portuguese national team, Pauleta is considered a late bloomer in terms of his development as a player. He made his debut in the First Division and the national team at the age 24, and went on to become the top goalscorer for Portugal. He scored his first two goals for the national team at the age of 26. Mathematics George Green, working as a miller and with no formal education in mathematics, published his famous An Essay on the Application of Mathematical Analysis to the Theories of Electricity and Magnetism in 1828, at the age of 35. Alexandre-Théophile Vandermonde started to study mathematics at 35, and began to publish in this field the same year. Eugène Ehrhart started publishing in mathematics in