At his age, should be even be driving a car on busy roads let alone flying a high performance aircraft ?
'course - you are never going to age and want to keep on driving, or flying, are you ?
If he passes his routine medicals and biennial flight checks who are you to deny him to any age ?
I maintained a CPL until age 75, not for some remuneration but for the qualification required for the voluntary task I wished to perform, and still hold a recreational flying licence, and no, my doctor isn't a "special friend"
and .... how many of those other drivers hurtling towards him on "busy roads " have ever even seen a doctor - have you ?