His WW I draft registration card, filed 5 June 1917, records Herbert Cooper, age 25, residence Hilda, Ky, born 2 Oct 1891 in Rowan Co., Ky, occupation farming, married supporting a wife & 3 children.

(The 1900 census gives his birthdate as June 1892, but the birthdates on that census seem largely fictional.)

Since his parents were married in September 1891, most likely he was born in October 1892.

Her death certificate records Lottie Cooper, age 30, born 21 Feb 1890 in Rowan Co., Ky, died 21 Feb 1920 in Brushy precinct, Rowan Co., Ky, married, father Gorg Jordan, born in Carter Co., Ky, mother’s maiden name Umphres, born in Rowan Co., Ky, cause of death had influenza followed by pneumonia fever, informant Gorge Jordan, Morehead, Ky, burial in Pervis Cemetery.

1920 census of Rowan Co., Ky, Brushy Fork precinct, enumerated 9 Jan, lists on p. 4B as family #54:
Cooper, Herbert, 28, farmer; Lottie, wife, 29; Delorse, dau, 8; Burnice, dau, 5; Pearl, dau, 2 2/11. All born Ky Ky Ky.

The preceding household is his mother and younger brother.