Consider yourself and your Mustang lucky.
My Mom lives in an area with lots of elderly retirerees and she tells me horror stories of accidents involving older folks. There's a push in some places to retest them at a certain age, and maybe it's safer that way.
I know, we all have stories of the 90-something aunt who can still motor along on the interstate with no problem. Fine, if they can drive they won't mind being retested.
People just don't want to give up their driving and independence but their accident rate is cause for concern, particularly for us on 2 wheels.
Ride safe!