A man was born somewhere in the 19th century. After "x" years the year becomes x^2. then in which year did man born?

• The man born between 1800 and 1850 which is a perfect square.
  The perfect square number is 43² = 1849 (note that 42² = 1764
  and 44² = 1936 )
  
  So in the year 1849 the man was 43 years old.
  
  which shows the year of born is 1849 - 43
  = 1807.
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