In 1999, a young man said: "My birthday has passed this year, and my age is just the sum of the four numbers in the year I was born." When was this young man born?
1999年的时候，一位年轻人说："今年我的生日已经过了，我的年龄刚好是我出生年份的四个数字之和．"问这位年轻人是哪年生的？
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