The position of this Georg Jakob Kaltenberger in the 1857 census indicates that he is the son of Georg Jakob Kaltenberger, born in 1826. The footnote after his age says "Age as Listed." The age listed is 31, the exact age as his father. Obviously this is an error, for father and son can't be the same age. I think there was a census taker error, and because their names were the same, Georg Jakob, he mistakenly wrote down the age of the father twice.
If Georg Jakob's father was born in 1819 and married when he was 24, that would mean he married around 1843. His second son was born in 1851, so I assigned first son Georg Jakob a birth year of 1847. If I learn his exact birth year is different, I will update his profile accordingly.
Head of the Household Heinrich Kaltenberger, age 60 in 1850, deceased 1853.
Child #1 Johann Adam Kaltenberger, age 50
Wife of Child #1 Katharina Kaltenberger, age 50
Grandchild #1 Georg Jakob Kaltenberger, age 25
Grandchild #2 Christian Jakob Kaltenberger, age 23
Wife of Grandchild #2 Katharina Margaretha Kaltenberger, age 23
Great Grandchild #1 Friedrich Jakob Kaltenberger, age 2
Grandchild #3 Christina Margaretha Kaltenberger, age 17
Grandchild #4 Louisa Kaltenberger, age 15
Grandchild #5 Konrad Kaltenberger, age 4 in 1850, deceased 1854
Child #2 Heinrich Kaltenberger, age 33 in 1850, to Rosenberg in 1852
Grandchild #6 Christian Jakob Kaltenberger, age 10 in 1850, to Rosenberg in 1852
Grandchild #7 Georg Jakob Kaltenberger, age 6 in 1850, to Rosenberg in 1852
Grandchild #8 Heinrich Jakob Kaltenberger, age missing from 1850 census, to Rosenberg in 1852
Child #3 Georg Jakob Kaltenberger, age 31 in 1850, to Unterdorf in 1852
Grandchild #9 Georg Jakob Kaltenberger, age 31 [sic] in 1850, to Unterdorf in 1852
Grandchild #10 Philipp Kaltenberger, age 6 in 1850, to Unterdorf in 1852
Child #4 Johann Philipp Kaltenberger, age 26 in 1850, to Unterdorf in 1852
Child #5 Konrad Kaltenberger, age 28
Wife of Child #5 Katharina Margaretha Kaltenberger, age 26
Grandchild #11 Johann Jakob Kaltenberger, age 6
Grandchild #12 Anna Barbara Kaltenberger, age 4
Grandchild #13 Johann Jakob Kaltenberger, age 1 year 6 months
Child #6 Johann Jakob Kaltenberger, age 28
↑1857 Census of Grimm in the District of Saratov, Russia, dated 5 November 1857; Translated by Brent Mai, Concordia University, Portland, Oregon; Published by Dynasty Publishing, Beaverton, OR, USA; Published 2005; page 7, family #15.
The Center for Volga German Studies at Concordia University, Portland, Oregon, online resources, Settlements, Daughter Colonies, Unterdorf see: http://bit.ly/2yXsXqO.