Simplify the following text for a Grade 4 native English-speaking person.
Original: Jigme Khesar Namgyel Wangchuck ( , born 21 February 1980 ) is the fifth Druk Gyalpo of Bhutan and head of the Wangchuck dynasty .
Simplified: Jigme Khesar Namgyel Wangchuck is the fifth Dragon King of Bhutan . He was born on 21 February 1980 .