An example is that of Pvt. John Vance, Co. H, 43rd Tennessee who enlisted February 20, 1862, age 40, to serve one year.
He was given a Certificate To Be Given A Soldier At The Time Of His Discharge, April 5, 1863 at Vicksburg,
" . . . and is now entitled to discharge by reason of being over 40 years of age and his term of enlistment having expired."
I am somewhat puzzled by this discharge as by this time the act had been revised to raise the maximum age to 45.
Perhaps the regiment had not been appraised of the revision.
Also, the younger fellows on the expiriation of their one year enlistment were given discharges as being under the age of conscription.
"The first Confederate conscription law also applied to men between 18 and 35, providing for substitution (repealed Dec. 1863) and exemptions. A revision, approved 27 Sept. 1862, raised the age to 45; 5 days later the legislators passed the expanded Exemption Act. The Conscription Act of Feb. 1864 called all men between 17 and 50."
George Martin