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They were established some hundred years ago , originat-ing from the three denominational main-streams in the Netherlands . " Three hundred years later , in the 1950s , many physicians believed the " athlete 's heart " was a sick , unhealthy one . These kinds of markings have been observed in roughly this same pattern for at least the last 300 years , since serious telescopic observations of Mars began . But it is well to remember that even in those days , a hundred years ago , the enemy did not take his defeat as final . The isolation period is usually up to 300 years , thus facilitating institutional and administrative control of the disposal site . In the past hundred years , computer science has changed the world more than any other field . The average age when their disease is detected is 46 , compared to 57 years old for white women.Earlier research has suggested that women who have surgery for breast cancer before going through the menopause , which usually occurs around the age of 50 , have a higher relapse rate.Scientists in the United States , Britain and Italy who studied databases on early diagnosis , death rates , and racial disparity believe surgery could be associated with the higher risk of dying from the illness . Society is moving at a greater speed now at the close of the twentieth century - in part thanks to the rapid developments in information and communications technology ( ICT ) - than ever it did in Europe two hundred years ago in the first industrial revolution . Unique stands of Pinus peuce and P. leucodermis , up to 250-300 years old and 30-45m high , are found in Baiouvi Doupki-Djindjiritsa Reserve . The most conservative estimate is 57 years , while a more liberal estimate is 121 years . An analysis of 40 districts reports that the average number of years taken to complete 5 years of primary education has dropped from 7.9 to 6.4 years .