Gyroscopic Investing

I know the contribution limits are $6,000 for 49 and under and $7,000 for fifty-year-olds, but what is the exact timing?
Can you contribute 7K in the same year that you *will* turn 50, or is it the year after that?

I am pretty certain you can take the bump up in the year that you turn 50.

Thank you, J.H.
Yeah, my accountant just chimed in with the same statement.