I'm also over 60 and still flying long haul while maintaining a class one Med and excellent performance results on my routine check rides/recurrent trng SIMs etc.
Although I'm obviously age bias I don't think it's fair to use age alone as a major factor of performance capability. I've flown professionally for 42 yrs and still enjoy my profession, when my performance begins to suffer or I feel I am no longer competent then I'll hang up the stirrups.
I fly routinely with young F/O's who have great difficulty regulating their rest periods or socializing at the detriment of their crew rest and cannot function properly without long sleeps in the cockpit.
We all need to be evaluated in our profession regardless of age, if we don't cut it then move on.