In the War of 1812, it was very common for boys to be enlisted in the regular U.S. Army. I have the military records of a 44 year old TN man who enlisted with three sons, ages 16, 14, and 12. The father died during the War and boys all completed their five year enlistments. Betcha none of them were boys when they were discharged from the Army.

Jeremiah Sr. and Hercules were transferred to the 1st Rifle Regiment. They were my 4th and 3rd g-grandfathers.

Capt. Uriah Allison and his Soldiers in the War of 1812, from Roane Co.

Jeremiah Buchanan, Sr. aged 44, 5 ft. 5 inch. Born in Benkers, Virginia,
and below his three sons:

Hercules Buchanan, aged 16, 5 ft. 11 inchs, born in Montgomery County,
Virginia.

Moses Buchanan, aged 14, 5 ft. 2 in. born in Montgmery County, Virginia

Jeremiah Buchanan, Jr. aged 12, 4 ft. 9 inches; born in Montgomery County,
Virginia.