1860 Census gives his age as 21, but it was actually 31.
Sources
Find a Grave, database and images (https://www.findagrave.com/memorial/93992738/john-grayson-bruce : accessed 21 February 2022), memorial page for Pvt John Grayson Bruce (1829–26 Mar 1865), Find a Grave Memorial ID 93992738, citing Oakwood Cemetery, Richmond, Richmond City, Virginia, USA ; Maintained by John Nash (contributor 46939656) .
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DNA Connections
It may be possible to confirm family relationships with John by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: