In regards to Jacob Hoover it appears my source is incomplete. It seems he was active from 1881-1897 at which time he sold his business to George Smith. Thank you kindly John!
UPDATE: I found some information regarding their oldest child, at least the oldest one I know of now. Carl Friedrich was born on April 27, 1856 in Hartford, Ottawa County, Ohio. He was baptized July 6th at St. Paul Lutheran Church in Danbury Township, Ottawa County, Ohio and died October 31, 1856 at 6 months, 4 days. It says he was buried in Hartford, Ohio. :-D Who can tell me where Hartford is?

This picture is brought to you by Uncle Bob. It was taken by Jacob Hoover of Oak Harbor, Ohio. If I look him up in 'Ohio Photographers: 1839-1900' it says:
Hoover, JacobThat would put Johann Fredrick Leutz at 54 or 55 and Louisa Frederica Zink at 55 or 56. Very possible if you ask me.
Oak Harbor, 1881-1882
Timeframe: 1881 & 1882, somewhere in that general area.
Where It Fits: Johann & Louisa are the parents of Carl, Gustav, Charles, Louisa & Clara. They are the grandparents of Oscar, Myrtle, Lorenz, Leon, Berlin, Clara, Edward, Emery, William, Edith, Esther and Fred Leutz & Omah, Homer, William, Ada, Luella, Maud and Clara Bisch.