Actually, I've heard of dating methods varying wildly. Then again, even if there is agreement with some methods that's also be expected, if indeed a miracle happened. If Jesus created wine instantly, there would be several factors that may lead one to a false view of its age. There would also be other anomalies that may suggest it is not old. Creation scientists point these out all the time:
1. Receding Moon - 750 m.y.a. max
2. Oil Pressure - 5,000 - 10,000 years
3. The Sun - 1,000,000 years max
4. The Oldest Living Thing - 4,900 years max
5. Helium in the Atmosphere- 1,750,000 years max
6. Short Period Comets - 5,000 - 10,000 years
7. The Earth's Magnetic Field - 10,000 years max
8. C-14 Dating of Dino Bones - 10,000 - 50,000 years
9A. Dinosaur Blood and Ancient DNA - 5,000 - 50,000 years
9B. Unfossilized Dinosaur Bones - 5,000 - 50,000 years
9C. 165 Million Year Old Ligaments - 5,000 - 50,000 years
10. Axel Heiberg Island - 5,000 - 10,000 years
11. Carbon-14 in Atmosphere - 10,000 years max
12. The Dead Sea - 13,000 years max
13. Niagara Falls - 5,000 - 8,800 years max
14. Historical Records - 5,000 years max
15. The San Andreas Fault - 5,000 - 10,000 years
16. Mitochondrial Eve - 6,500 years
17. Population Growth - 10,000 years max
18. Minerals in the Oceans - Various (mostly young) Ages
19. Rapid Mountain Uplift Less than 10 million years
20. Carbon 14 from "Old" Sources - 10,000 to 50,000 years
21. Dark Matter and Spiral Galaxies -100 - 500 million years (max)
22. Helium and lead in Zircons - 6,000 years
Source