I agree with the award winning Brad, and will add that when I have followed the careers of aging PGA Tour (or senior tour) stars, it seems like there demise starts out as one bad round of four, whereas the winner (and younger guys who finish high) have four good rounds. At that period of time, we might think our heros still have it, and had some bad luck, but in reality they are starting to lose "it."
A few years later, its two bad rounds, with one after making the cut, and then its two bad rounds to miss the cut....
In other words, one good round doesn't make an old wheezer competitive!