omg123,
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The only way you can determine how many times the root has sent up a top is to count the neck scars on the neck. However, this will in no way determine the true age of the root as most Ginseng roots and especially older one's such as the one you found, have more than likely had to go dormant several or more times during their' lifetime. The dormancy (when the root does not send up a top) can last one year, 5 years, 10 years and even up to 20 years with some of the real old roots. The length of the dormancy depends upon what the plant and root suffered which caused it to go dormant and conditions in following years after it goes dormant. These can be due to natural disasters such droughts, fires or storms that down trees that provided it with enough shade to survive. It can also be due human intervention such as logging, construction or even sometimes, the transplanting of a root to a new location. Another problem in determining age of a root is whether the neck which includes the neck/growth scars is totally intact and has never suffered damage, it is not totally intact due to damage (mainly damage from rodents but sometimes disease) and/or it is the original neck (i.e. sometimes a root will grow a new neck or grow a new fork on the neck due to damage).
I would recommend keeping the root fresh, finding a Ginseng Dealer/Buyer that will get the root certified for you (probably at some cost), obtain a printout of the certification which shows where it was harvested, the Date and weight, then list the root on eBay for auction. Make sure to include really good pics of the root with the Auction Listing and a pic of the certification sheet. You can keep the root fresh by placing it in a bag with the root surrounded by Moss or Log Moss, kept moist and stored in the crisper drawer of your' refrigerator.
Note: I have copied and pasted your' pic of the root to my' PC, orientated the pic to the upright position and posted it below.
Frank