后杭爱省
Demid was born in 1900 in present-day Ikh-Tamir, Arkhangai Province. In 1921 he joined the Mongolian People's Party and fought as a partisan during the Mongolian Revolution of 1921. After the revolution, Demid served in the Mongolian military and taught at Mongolia's Military Academy. From 1926 to 1929 he studied at the Red Army Cavalry School in Tver, returning to Mongolia in 1929 to take command of the Military Academy.