from the 1885 Hendricks County History:

Aaron Overstreet, son of James and Susan Overstreet, was born Jan. 19, 1826, in Casey County, Ky. His parents' family consisted of six children--Maria, John, Rebecca, James, Aaron and Parmelia. Aaron was reared to maturity in his native State and received but a limited education. He was married Dec. 24, 1850, to Miss Catherine Elder, and to them were born twelve children, nine of whom are living--Susan M., Fred W., John G., Martha J., Aaron S., Legrand F., Lilian G., Lee and Oliver P. In the spring of 1852 Mr. Overstreet came to Hendricks County, and after living in several different parts of the county, finally settled in Union Township, where he still resides and owns sixty-three acres of land. In August, 1862, he enlisted in Company G, Ninety ninth Indiana Infantry, and participated in the battles of Jacksonville, Chattanooga, the surrender of Vicksburg, the Atlanta campaign, and Sherman's march to the sea. He received an honorable discharge in August, 1865. In politics he is a Republican. He and his wife are members of the Christian church.

Additional Notes: Enlisted at the age of 36 on August 15, 1862. 5'6" and 142#. Sandy complexion, blue eyes and sandy hair. Served as Corporal of Captain Benjamin Thomas Company. Company G, 99th Indiana Infantry.
His family back in Kentucky were Confederates, disrupting familial relationships. When Aaron enlisted, four children were already born and Catherine was pregnant with the fifth (Aaron Sylvester Overstreet), born seven months later. They had five children after he returned.

from the Republican for June 30, 1910:

A Soldier Gone. Aaron Overstreet, Sr. was born in Casey County, Ky., January 19, 1826, and died at his home in Lizton, June 22nd, 1910, aged 84 years, five months and three days. He was united in marriage to Catherine A. Elder, December 24th, 1850. They moved to Hendricks county in 1852 and have lived here since then. The widow survives. Twelve children were born to this couple, nine of whom survive. Those living are Susan M. Kennedy of Lizton; Fred W. Overstreet of Loami, Ill., John Guy Overstreet, of Thorntown, Ind., Martha J. Hale, of Lizton; Aaron S. Overstreet, of Pittsboro; L. Ford Overstreet, of El Reno, Oklahoma; Lillian G. Tucker, of Jamestown; R. Lee Overstreet, of Pittsboro; and Oliver Perry Overstreet, of Lizton. Three children died when young. There are twenty-eight grandchildren and four great-grandchildren. The deceased was a Union soldier in the Civil War. He enlisted August 15th, 1862, in Company G of the Ninety ninth Indiana Volunteers, and was honorably discharged June 5th, 1865. He was with Gen. Sherman in the famous "March to the sea" and the late chaplain D. R. Lucas recorded of him that "He was a faithful soldier." In the prime of life he was actively identified with the Christian church of Lizton; also the Masonic fraternity at North Salem, and later, with the G. A. R. In character, he was honest, cheerful and optimistic to a marked degree. He was always industrious, yet hospitable almost to a fault. He had great faith in the better side of human life and, throughout his career, was unselfishly devoted to a high plane of moral thought.

from the Indianapolis Star for June 24, 1910:

Overstreet Relative Dies

Lizton Civil War Veteran is Victim of Paralytic Stroke

Lizton, Ind., June 23 - Aaron Overstreet, a relative of the late Representative Overstreet and a resident of Indiana since 1832, is dead of paralysis at his home here. Mr. Overstreet was 84 years old, and was a veteran of the civil war, having served three years in Company G, Ninety-ninth Volunteer Regiment. His widow and nine children survive.