St. Rita of Cascia: Saint of the Impossible: Wife, Mother, Widow, Nun (1381-1457)

Description

One of the most popular Saints in the Church for centuries, St. Rita is known as the "Saint of the Impossible" because of her amazing answers to prayers, as well as the remarkable events of her own life. Desirous of being a nun, she instead obeyed her parents and married. Her husband was cruel, and caused her much suffering, to which she responded with love and prayers and eventually converted him. After the death of her husband and two sons, Rita was able to enter a convent, where she devoted herself to prayer and penance. She abandoned herself totally to God, diminishing herself as He increased in her. An inspiring story of a soul completely resigned to God's will. 132 pgs,

St. Rita's mother Amata was at least 84 years old! when she gave birth to St. Rita (source):

Ch. 2, "The Birthplace and Parents of St. Rita," of Sicardo & Murphy's 1916 biography of her says Antonio Lotti and Amata Ferri were married in 1309. Ch. 3, "St. Rita's Birth," says "The biographers of St. Rita give the day, date and year of her birth as Saturday, May 22, in the year of Our Lord 1381, during the pontificate of Pope Urban VI."

So, assuming she married at an age of 12 in circa 1297, this means Amata was at least 84 years old when she had St. Rita.
(If she married in her 20s in circa 1289, she would've been at least 92 when she had St. Rita!)
the youngest age, according to canon law, that a female could marry back then, assuming she reached puberty by then; in fact St. Rita herself became a wife at 12 years of age according to this

Ibid. says:

Words cannot describe the indescribable joy of Antonio and Amata as, with loving eyes, they gazed on their little daughter whom they considered a precious gift of God, the fruit of their desires, and the reward of their long years of hope and confidence in God. The unexpected news that Amata Ferri had become a mother in her old age was the cause of much surprise, talk, and gossip among the inhabitants of Rocca Porrena. All considered the event as truly miraculous. Every man, woman, and grownup child of the little hamlet went to offer congratulations to the happy and overjoyed parents, and all who gazed on the smiling face of the newborn babe were charmed by the radiance of the little one’s wonderful beauty.