Now I did find a similar Civil War record from Richmond Virgina:
Name: John Turner
Side Served: Confederacy
State Served: Texas
Service Record: Enlisted as a Private.
Enlisted in Company K, 21st Cavalry Regiment Texas.
Sources: 425
Name: John Turner (THIS MAY BE A MATCH, BIRTHDAY IS OF BY A FEW DAYS)
Enlistment Date: 14 Mar 1862
Enlistment Place: Richmond, Virginia
Side Served: Confederacy
State Served: Virginia
Birth Date: 19 Oct 1846
Service Record: Enlisted as a Private on 14 March 1862 at the age of 15.
Enlisted in Parker Light Artillery Regiment Virginia on 14 Mar 1862.
Sources: 21 ( http://search.ancestry.com/cgi-bin/sse.dll?ti=0&indiv=try&db=hdssoldiers&h=6687248 )
Name: John R Turner (SAME RECORD BUT HAS IT AS A JOHN R. TURNER -NOT T.?)
Age at Enlistment: 15
Enlistment Date: 14 Mar 1862
Rank at enlistment: Private
Enlistment Place: Richmond, VA
State Served: Virginia
Survived the War?: Yes
Service Record: Enlisted in the Virginia Richmond "Parker" Light Artillery Battery on 14 Mar 1862.
Birth Date: 19 Oct 1846
Sources: The Virginia Regimental Histories Series