When Johann Friedrich Theodor Bahr was born on 2 October 1823, in Surendorf, Hohenhain, Eckernförde, Schleswig-Holstein, Prussia, Germany, his father, Carl Hinrich Bahr, was 24 and his mother, Elisabeth Dorothea Weidemann, was 25. He lived in Denmark in 1845. He died on 24 September 1845, in Stohl, Dänisch Nienhof, Eckernförde, Schleswig-Holstein, Prussia, Germany, at the age of 21.