Amant was born as Julia Marguerite Adélaïde Valentin in the village of Pouzols, Monlet, in the French department of Haute-Loire. On 20 September 1932, she married Pierre Amant and had three children: Gabrielle, Roger, and René, the latter of whom died on Christmas Day, 2009. For 40 years the couple worked in a butchers shop. Amant retired in 1972, and was widowed in 1986.
Amant moved into a retirement home in the nearby commune of Saint-Paulien on 18 November 1999. At the time of her 110th birthday, she had six grandchildren and nine great-grandchildren. She died on 30 October 2021 at the age of 110 years, 130 days. Four days prior, her son Roger had died aged 82.
Amant was first noted for her longevity on her 105th birthday, when 15 students aged between 6 and 18 performed musical pieces to her and other residents of her nursing home. The group performed again the following year.
Amant’s age was verified by Cyril Depoudent and Les Grands Centenaires Français, and validated by the ESO on 16 July 2021.