He was an apprentice too of Andrea del Verrocchio, where Leonardo da Vinci worked beside him, but he made his name in his local Church of Ognissanti, with a "St. Augustine" that successfully competed as a pendant with Domenico Ghirlandaio's "Jerome" on the other side "the head of the saint being expressive of profound thought and quick subtlety" (Vasari). In 1470 he opened his own independent "studio".At what age did he start art?