Florence appears younger in this photo than in her engagement photos when she was age 21. In this photo, she appears to be 16-19 years old. It is a difficult choose, but 18 seems about right. The time of year appears to be late Spring or early Summer. Perhaps a reasonable guess would be her 18th Birthday - July 3, 1918, though that date could easily be a year or so off.
Beverly Lynch inherited this portrait from her father Charles J. Jordan, the 3rd son of James Oscar Jordan and brother of Frances Florence Jordan. In the late 1980s, Beverly gave this photo to Dave Jordan as part of his genealogy research into the Jordan family.
If you would like to add information about this photo, please contact Dave Jordan. Margaret Knowles Jordan Graham was his g-grandmother and Frances Florence Jordan Hollinshead was his great-aunt. The Picture Reference Number is DJJ07.