Spring 1843 - Joseph Smith (Age: 37) married Flora Ann Woodworth (Age: 16).
"By 1843 Lucien Woodworth had become a close associate of Joseph Smith and was the architect of the Nauvoo House hotel (D&C 124). In spring of that year, Joseph married Lucien’s, sixteen-year-old, daughter Flora Ann. William Clayton, Joseph’s personal secretary, noted subsequent visits the Prophet made to Flora. She is mentioned in Clayton’s diary more often than any of Joseph’s other plural wives: May 2nd: “Joseph rode out today with Flora W.” June 1st: “Evening Joseph rode in the carriage with Flora.” August 26th: “Hyrum and I rode up to my house and Joseph met Mrs. Wdth and F[lora] and conversed some time.” August 28th: “President Joseph met Ms Wdth at my house.” August 29th: “A.M. at the Temple. President Joseph at my house with Miss Wdth.”" (In Sacred Loneliness: The Plural Wives of Joseph Smith pgs 389–391)
"In the midst of these encounters, Emma, became aware of the relationship when she recognized a gold watch that Joseph had given to Flora as a gift. On August 22nd Clayton recorded: “President Joseph told me that he had difficulty with E[mma] yesterday. She rode up to Woodworths with him and called while he came to the Temple. When he returned she was demanding the gold watch of F[lora]. He reproved her for her evil treatment. On their return home she abused him much and also when he got home. He had to use harsh measures to put a stop to her abuse but finally succeeded.”" (Mormon Enigma: Emma Hale Smith pg 159; In Sacred Loneliness: The Plural Wives of Joseph Smith pg 388)
"The secrecy surrounding Joseph and Flora’s marriage caught nineteen-year-old Orange Wight by surprise. He wrote, “[Having just returned from a mission] I concluded to lo[o]k about and try to pick up one or more of the young Ladies before they were all Gone, so I commenced keeping company with Flora Woodworth... [We were walking near Joseph’s home when he rode up in a carriage and invited us to take a ride]...he drove to the Woodworth house and we got out and went in - After we got in the house sister Woodworth took me in an other room and told me that Flora was one of Joseph’s wives...Sister Woodworth gave me all the information nessary, so I knew Joseph Believed and practiced Poligamy...Now as a matter of corse I at once...left [Flora] and looked for a companion in other places and where I could be more sure."" (In Sacred Loneliness: The Plural Wives of Joseph Smith pg 390)
"When Joseph Smith was killed in 1844, Flora became a widow at age seventeen. Later that year she married Carlos Grove, a non-Mormon. In 1846, they left Nauvoo, headed for Utah, but stopped for a time at Winter Quarters. There they met up with members of the Whitney Family. Helen Mar, another one of Joseph Smith’s wives wrote, “Flora...had been very sick, but is now slowly gaining her health. [She felt] condemned [for marrying a non-Mormon and] made this confession to me while I was nursing her, and said she desired to cling to Joseph hereafter.”" (In Sacred Loneliness: The Plural Wives of Joseph Smith pgs 391,392,394)
"Never making it to Utah, Flora passed away in Kanesville, Iowa around 1850. Helen Mar wrote, “I never saw her again as she died at that place, leaving two or three children.” Flora would have been in her mid-twenties at the time." (In Sacred Loneliness: The Plural Wives of Joseph Smith pg 394)
Source Material: http://wivesofjosephsmith.org/19-FloraAnnWoodworth.htm