I have a few roots that are that old. one that weighed wet2.04 ounces and one at .08 ounces and one more that I did not weigh. I would guess that these are at least 50 years of age.
One of these roots has 29 stem marks but as most know,ginseng does not come up every year. I guess it sometimes lays in the ground for afew years.
I have seperated these roots and they are not fully dried yet but if interested, I can send a photo of each with there weight at this time. They are about 60% dried and I expect them to be fully dried in about one week.