The measured C-14 age of bristlecone wood that is 900 years old would be approximately 700 years. This is because after about 8-10 half-lives of C-14, the remaining amount of C-14 is too small to be accurately measured. Since the half-life of C-14 is approximately 5730 years, after 900 years, the amount of C-14 remaining in the wood would be minimal and difficult to measure accurately.
