Anna Ivanovna Mironova claimed to have been born in a peasant family in the village of Berkaikha, Nekrasovsky District, Yaroslavl Oblast, Russian Empire (now Russia), on 11 February 1908. In 1936, she married Nikolai Grigorievich Mazaev. They had three children (one son and two daughters).
In September 1941, her husband volunteered for the front. At that time, she worked on the collective farm. At the end of October 1942, her husband was killed in a battle. Her young son died in 1943. She was left alone with her daughters.
On her claimed 110th birthday, her two daughters were still alive. At that time, she also had 4 grandchildren, 5 great-grandchildren and 3 great-great-grandchildren.
Mazaeva was last confirmed alive on 13 February 2018, at the age of 110 years, 2 days. At that time, she lived in Yaroslavl, Yaroslavl Oblast, Russia.