He is listed in the 1850 census as age 17, a Saddler born in Ohio, living with the family of David & Margaret Mercer.
However, he also appears to be listed with his widowed father in Vinton Co as age 16 born in Ohio, and a laborer.
Will of John Cooper -
In the name of the Benevolent Father of All;  I, John Cooper, Martinsville, Belmont Co, and state of Ohio, do make and publish this my last will and testament.
1.  It is my will that my just debts and all charges be paid out of my estate.
2.  I give and bequeath to my beloved brother Francis R. Cooper one hundred dollars to be appropriated to his education as much as possible.
3.  To my beloved brother Eseriah P. Cooper one hundred dollars to be appropriated to the same as above.
4.  I devise and bequeath to my brother William K. Cooper all of my tools and tool chest together with one hundred and fifteen dollars which money I owe him and it is my devise should be paid out of my estate as he holds my note or obligation for the same.
5.  I leave to my brother Isaac Newton Cooper my Trunk, my Watch, and twenty five dollars.
6.  To my sister Sarah Catherine Hastings twenty five dollars.
7.  To my sister Hannah J. Judkins twenty five dollars.
8.  It is my devise that all the residue of my estate be equally divided between all my brothers and sisters and that Henry Heberling be my executor.
In testimony whereof I have hereunto set my hand and seal this 27th day of Feb. 1858.
 
Signed and acknowledged by said John Cooper his last will and testament in our presence and signed by us in his presence.
John Regent
(second name unclear)