A middle-aged life in the five elements of fortune telling corresponds to the years of Bing Yin and Ding Mao in the five lines of Yin Na. That is, people born in Bing Yin and Ding Mao are doomed to "fire in the furnace".
When the sum of the date of birth is divided by 2, the ten digits are 0, 3, 4, 7 and 9 respectively (for example,1April 7, 998 1998+4+7 = 2009, 2009 ÷ 2 = 1004.5, and the hundred digits are 0.