R.I.P. Addwaitya
Of course there are plenty of plants around that are much much older, but few with such personal associations as this venerable reptile. Here is a list of some ancient plants:
A 5000 year-old yew tree in Scotland
The “oldest potted plant in the world” at Kew Gardens
A 40,000-year-old shrub, known as King's Holly, in Tasmania
The King's Holly is interesting in light of Celtic mythology about the Holly King and the Oak King. According to the myth, the Holly King and the Oak King represent two sides to the Greenman. The Oak King is born at Yule, and his strength grows through the spring, peaks at Beltane and then he weakens and dies at Samhain. The Holly King lives a reverse existance, and is born at Midsummer, waxes more powerful through the summer and fall, to his peak at Samhain. His influence then lessens until Beltane, when it is his turn to pass away.
Since the Holly King lives a reverse existance and Tasmania has its seasons reversed because it's in the Southern Hemisphere, it seems like a fitting place for the Holly King to live.