Glad you got back with more information.Unfortunately, I do not have an immediate answer.The information that you have about James Adams who died between 1820-1830 is very close to my ancestor James.His wife was Jane Cunningham and they married June 19, 1772.You said that you believe that your James and Jane married about 1770.My James and Jane were married in Charlotte County, VA, but James father was from Fluvanna County and his grandfather Robert Adams was from Goochland County.
You mentioned that James and Jane had at least 3 children.Do you know thier names? What information do you have that narrows the death of James to between 1820 and 1830?
To complicate matters, I believe that there were 18 James Adams on the Virginia 1830 census as heads of households. Nothing is easy.