I found two Thomas L serving Georgia. One in the GA 55th Infantry, Company F, later in K. The second, GA 63rd Infantry, Co. E.
A Thomas L. served the TN 63rd Infantry, Co. B, an a Thomas Lucius Smith served TN 4th Battalion cavalry, Co. E.
Few confederate records list age or date of birth. If none of the above seem to match your search, can you provide his date of death and what state he died in?