Chulalongkorn was born on September 20, 1853 and died on October 23, 1910. Chulalongkorn would have been 57 years old at the time of death or 158 years old today.
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There is no clear answer, some youngins are old and some oldins are young. Another opinion: At least 80. On the lighter side. This answer was kindly dedicated to Lazarus