I used the 50 000 years old age simply because that was the number bluescat48 used as a hypothetical maximum date. I think with the new mass accelerator technology, we can push carbon-14 dating up to 250 000 years old.
But since it wasn't really the issue here, I simply used the same 'maximum date' as bluescat48. It doesn't change the essence of what I was trying to say: creationist would predict that carbon14 would be found. Evolutionists would not. If only negligeable traces of carbon14 (inside the uncertainty) would be found, it would cast doubt on the creationist interpretation.