The family group sheets I got from Hal Phillips give a birthdate of Jan 1888 for Albert, but the 1900 census says Nov 1881, which is consistent with both his gravestone and with the 1910 census (age 30.)

His death certificate (Vol. 7, #03034) states Albert Riddle, age 55, born 1882 in Ky, died 27 Feb 1937 in Forge Hill precinct, Bath Co., Ky, married, husband of Carrie Gregory Riddle, father George Riddle, mother Mary Johnson, cause of death “found dead in barn, coroner verdict heart failure, informant Edgar Riddle. He is buried in the Old Virginia Cem., Bath Co., with a birthdate of 24 Nov 1881 on his stone.

In 1910 Albert is listed as age 30, divorced, living with his parents. I have not found him in 1920.

1910 census of Fleming Co., Ky, enumerated 22 April, lists on p. 6A as family #94/95:
Gregory, Thomas J., 73, farmer; Martha J., wife, 63, married 47 years, mother of 9 children, 6 living; Reeves, Carrie, dau, 24, divorced, mother of 1 child, living; Reeves, Stella, 5, granddau. All born Ky Ky Ky.

1920 census of Bath Co., Ky, Forge Hill precinct, enumerated 17 Jan, lists on p. 6B as family #117:
Gregory, Carie, head, 34, widowed; Stella, dau, 15; Martha J., mother, 74, widowed. All born Ky Ky Ky.

Marriage date estimated from the 1930 census.

1930 census of Bath Co., Ky, Forge Hill precinct, enumated 7 April, lists on p. 3A as family #47/51:
Riddle, Albert, farmer, 45, age at first marriage 38; Cara, wife, 39, age at first marriage 32. Both born Ky Ky Ky.

Both Albert and Carrie had been previously married and divorced, so I am assuming that the age at marriage actually represents their marriage to each other, rather than their first.