As a gliding instructor I have found that the learning curve once the candidate is over the age of 60 is more like a plateau. Also, if the aspiring pilot has been a captain of industry before retiring, he usually has an inflated idea of his ability.
At my age, 77, I do have trouble remembering names. What was the name of that irritable young man who wants to enhance his own advancement by removing any wise old captains who are blocking his progress? I hope he never has the chance to fly my family! Too much anger to be safe.
If a pilot has been flying consistently for years and years and kept abreast of developments, it would be inappropriate to require retirement before 65. After that, well.....
we've all got to step down some time. Now, where did I put my bus pass?