According to this, he was about 50 years old when he made the prophecies that he is most famous for today: "Nostradamus, (December 14, 1503 – July 1, 1566) born Michel de Nostredame, is one of the world's most famous authors of prophecies. He is most famous for his book Les Propheties, which consists of rhymed quatrains (4‑line poems) grouped into sets of 100, called Centuries...He settled down in 1547 in Salon where he married a rich widow named Anne Ponsarde Gemelle and had six children - three daughters and three sons. He began to move away from medicine and towards the occult, at the same time opening a cosmetics business. He wrote an almanac in 1550, and was so encouraged by its success that he decided to write one yearly. He then began his project of writing 1,000 quatrains (four-line poems), which form the supposed prophecies for which he is famous today. Due to the scrutiny and pressure of the Inquisition, however, he devised a method of obscuring his meaning by using word games and a mixture of languages such as Provençal, Greek, Latin, Italian, Hebrew and Arabic." [source http://en.wikipedia.org/wiki/Nostradamus]