Which is older, the Yellow Emperor or Yan Di? About what? How many years BC?

I looked up a book I just bought. Yandi and Huangdi are half-brothers. In the book, Yan Di ranks first, and Huangdi ranks last. Known as Shennong, surnamed Jiang, the Yellow Emperor is known as Xiong and Xuanyuanji.

Emperor Yan lived in 120,

The reign of the Yellow Emperor was10/year, from 2698 BC to 2598 BC (I don't know why it can be written so accurately in Mr. Bai Yang's book).

In addition, I remember the legend that Yandi was defeated by Huangdi in the war between Yandi and Huangdi.