I noticed that somebody wrote that Henry Clay Avent was born in Talbot County Georgia. There's also a John Avent in the 1830 Talbot County census with one boy, four girls, showing the boy's birthdate between 1815-1820. He would be 10-15 years old in 1830 which would fit with Henry's birthdate of 1820.
Other Avents in Talbot County then besides John were William, Peter, and Benjamin. Peter was Benjamin's father and it's possible John, William, and Benjamin were all brothers.