Family #19 in the 1767 Grimm census.
Family #59 in the 1775 Grimm census.
Johannes Fischler is first mentioned as the almost 15-year-old son of Johannes Fischler and his wife Magdalena in the 1767 Grimm census. This gives the younger Johannes a birth year of about 1752. This means there is a typographical or census taker error in the 1775 census which identifies him as being 33 years old instead of 23. See comments below for additional details.
Head of the Household Johannes Fischler, age 37, Reformed, Craftsman from Hanau
Wife Magdalena Fischler, age 37
Child #1 Johannes Fischler, age 14 years 6 months
Child #2 Anna Margaretha Fischler, age 12
Child #3 Anna Katharina Fischler, age 6 years 6 months
There appears to be a transcription or census taker error regarding his age in the 1775 census. He was 23, not 33, giving him a birth year of 1752, not 1742.
1775 minus 1767 = 8 years between the two censuses
14 years 6 months old in 1767 plus 8 years = 22 years 6 months old in 1775
1775 census says he is 33 years old; should be 22 or 23 years old
In the 1775 census, he is married to a woman named Barbara, 21 years old. The couple had one son, Andreas, who was 3 months old. Also living with the family was Jakob and Agnes Maria Gold, both 64 years of age. There is no note explaining their relationship to the Fischlers, but one guess would be that they were Barbara's parents or some other relatives.
Head of the Household Johannes Fischler, age 33 [sic]
Wife Barbara Fischler, age 21
Child #1 Andreas Fischler, age 3 months
Others living in the same household
Husband Jakob Gold, age 64, possible parent of Barbara
Wife Agnes Maria Gold, age 64, possible parent of Barbara
Johannes and his family do not appear in the 1798 Grimm census. It's possible the family moved to a different village, but I haven't been able to locate them. The only Fischlers in the 1798 census are related to the Ludwig Fischler family, a different family from Johannes, Barbara and Andreas Fischler, who also lived in Grimm.
Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767, Band 2, Herausgegeben von Alfred Eisfeld under Mitarbeit von Sabine Eichwald, Published by the Nordost-Instsitut - 38085 Göttingen, 2005; page 76, family #19, Johannes Fischler family.
↑The 1775 and 1798 Census of the German Colony on the Volga, Lesnoy Karamysh, also known as Grimm; Published by the American Historical Society of Germans from Russia, Lincoln, Nebraska, USA; Published date: 1995; family #59 in the 1775 Grimm census, Johannes Fischler family.