17:37 Jan 5, 2011 

AFAIK both supernumerary teeth and rudimentary teeth may develop in all ages. The same applies to the wisdom teeth that are normal unlike the abnormal supernumerary and rudimentary ones. Who knows, maybe they grow better when adult teeth are not in the mouth and there is left a lot of place for them ;)

P.S. One friend of my sister had two rows of teeth in her moth, and both of them were adult teeth.

17:21 Jan 5, 2011 

I would like to withdraw my answer. Literal translation from Turkish led to a wrong meaning in English, I guess. According to wikipedia, "Third molars are commonly called "wisdom teeth" and may never erupt into the mouth or form at all. If any additional teeth form, for example, fourth and fifth molars, which are rare, they are referred to as supernumerary teeth.... supernumerary teeth, or teeth which appear in addition to the regular number of teeth." If this is what you mean then in Georgian there is a scientific term - ზეკომპლექტური კბილები. But I did not see anywhere that such teeth develop at extremely old age.
"

16:57 Jan 5, 2011 

Today I talked to my dentist and he told me that in extreme old age the wisdom teeth may develop that did not develop earlier, or it may be some rudimentary teeth, which may develop very rarely and not all adult teeth are replaced... So maybe the term you are looking for is "rudimentary teeth"? If yes, it is "რუდიმენტული კბილები" in Georgian.

09:02 Jan 2, 2011 

In Georgian, the following terms are for teeth:
* milk teeth – სარძევე კბილები - the literary translation sounds the same way as English term “milk teeth”
* adult teeth – მუდმივი კბილები - the literary translation is “permanent teeth”
* then additional four permanent teeth develop in adults – two teeth in the upper jaw and two teeth in the lower jaw. They are called “wisdom teeth” – სიბრძნის კბილები.
I am not sure if a term exists for the third set of teeth after the adult teeth in Georgian, but I will let you know if I find it somewhere.