That is to say, almost 5000 years later.
That's what the record says, but it must have been earlier. Chinese medicine can't be invented by him alone. It must have been passed down from generation to generation, and then he became popular. He is also recorded as the founder.
Primitive society should have existed as early as 5000 years ago. But it is recorded that Shennong tasted a hundred herbs. So take him as a benchmark.
Over 4600 years.