听力原文： Leonardo da Vinci was born in 1452 in Taskani. As early as 1466, he was working in a workshop. Then, in 1482, he moved to Milan. After the plague had swept the city in Milan in 1484-85, he turned his attention to town planning and made several designs for churches and other buildings. He moved to Florence, another city in Italy in 1500, where he painted the famous Mona Lisa in 1503. Then, he returned to Milan between 1510 and 1515 after he had been working as an architect and engineer for the French king Louie XII. He devoted himself to painting again and produced three great works, 'sin to end', 'Mary and Child' and 'Saint John the Baptist'. In 1515, the king of France invited Leonardo to live in France. He moved to a castle there, where he spent his last years carrying out his own research. He died in 1519. How old was Leonardo da Vinci when he moved to Milan?