Sonny, I'm not exactly sure how old the Cara Cara is, perhaps 15+ years old. The tree was planted in the ground some years back inside my greenhouse, but I've forgotten in what year. It is a grafted tree growing on Flying Dragon rootstock. In fact every citrus tree that I have (20+-) are grafted on Flying Dragon rootstocks. I was out looking at the Cara Cara this afternoon and most every fruit on the tree is now starting to get some yellow coloring to it. - Millet