Youngest reigning monarch of a sovereign nation

Youngest reigning monarch of a sovereign nation
Who
Sheikh Tamim bin Hamad al-Thani
Where
Qatar
When
14 December 2020

The youngest monarch is currently Sheikh Tamim bin Hamad al-Thani, Emir of Qatar (b. 3 June 1980). As of 14 December 2020, he is aged 40 years 194 days. He became Qatar’s ruler on 25 June 2013, aged 33 years 22 days, upon the abdication of his father, Hamad bin Khalifa Al Thani.