i am sorry, but HMS Victory is the oldest commissioned ship in the world. Her keel being laid down in 1759.....She remains a flag ship today..
I really have to smile--after reading a very well done history of Victory, I found that she contains about 20% of the original materials she was built with. It reminds me of a story my dad told me when I was quite young. He had a hammer that he told me belonged to his dad, it was all original, except that the handle had been replaced four time, his dad had replaced the head once, and he had installed a new head on it back in the 20s. Ah yes, restorations are indeed wonderful.
The Constitution however has much more of her original materials intact, she is still afloat and she is turned twice a year because of the effects of the sun. We Americans love our antiques as well even if much of it came from England when we shifted out.
Tis a great day for models--they do not cost nearly as much to maintain as one of the real ones.