I used to make caps crowns and bridges for dentists, and you can actually tell a lot by the dentures you have (although I have had less experience with dentures). First off, since they contain gold they are old.... Newer dentures don't contain gold, and the construction of those dentures suggests they were made quite a while back. I have seen old dentures made with 24 kt gold.......and to say the least it looks like you have a full set (1/2 oz t.w. or more). I would say they look to be from the 20's/30's in age, but they could be older...