Years ago, attending an Aerospace Medical Association (AsMA) meeting, I sat in on a panel concerning aging pilots. The chief Flight Surgeon from, I believe it was Norway – so European rules, gave a brief on “old people”. A seventy year old can have 20/20 vision, but he’ll need this many more lumens to see. They can have this, but they’ll need that – for ten minutes. At the end, his last slide was a simple curve with age increasing along the bottom and Everything Else on the Y axis. He pointed to a spot on the curve and said, “if you can provide a test with 100% accuracy, I’ll let you fly this long. Until then, it will be decided by legislation; not science.”