What I meant is that it would not have been surprising if Graham had had an abdominal scan at some point by age 71.
Moderately unusual, perhaps, but not wildly unlikely.
I will be fifty six in August, and have not spent a single night hospital since I left the maternity ward. Each year I age, this fact becomes more surprising, but statistically it's inevitable that there will be a handful
of people who have had the same good luck with health and injuries.
And of course, if he had a scan before the aneurysm became detectable, it wouldn't have helped, so it's not 71 years without a scan, but more like two or three decades, maybe a lot less if it developed rapidly.