Date of birth inferred from 1850 census. If my interpretation is correct, he appears both with his father-in-law's family on August 24th, and with his father's family on August 20th (marriage was Aug 18th, unless that is just a bond date.) Another possibility is that there were two Jacob Frantz's born in 1828 in Clark County.

Listed on p. 21 and page 27 of the Dore M. Frantz burials document. On page 21 her date of birth is given as 22 May 1821 and her date of death as 3 Sep 1857 and the notes identify her as "wife of Jacob Frantz, daughter of Michael and Susannah (Neher) Frantz". On page 27 it gives her birth as 1831 and her death as 1857, and the notes identify her as "Lydia Frantz nee Frantz, wife of Jacob, son of Rev. John, gr.son of Daniel I. Jacob married Fanny Shull as 2nd wife and moved to Illinois. Daughter of Jacob, gr.daughter of Michael, gt.gr.daughter of David I." Since Michael and Susannah were not married until 1823, and in 1821 Michael was married to Elizabeth Crist and had a daughter Elizabeth born in 1821, and since she would be unlikely to marry a man seven years her junior, I am assuming that her date of birth is 1831, and 3 was misread as a 2 in the first listing. I am for now using the lineage from page 21, as there is a Lydia age 20 with the Michael Frantz/Susanna Neher family in the 1850 census, and I do not have any other reference to a Jacob Frantz born to Michael Frantz son of David Frantz.

Thomas Beardsley's submission on the Michael Frantz family lists "Lydia, b 22 Nov 1830, d 3 Sep 1857, m 18 Aug 1856 Jacob Frantz"