What age did Mikhail Gorbachev become a member of the Politburo ?
On 23 December 1985 , Mikhail Gorbachev appointed Yeltsin First Secretary of the Moscow Communist Party , effectively ' Mayor ' of the Soviet capital , and as a result , on 18 February 1986 , Yeltsin was invited to become a Candidate ( non - voting ) Member of the Politburo .