In some ways my driving has improved as I got older. True, reaction time, vision, being able to sit in a fixed position for long amounts of time have degraded to various degrees. But, I am more experienced, better able to avoid dangerous situations, and have had far fewer close calls in the last few years.
OTOH, I no longer feel capable of doing performance driving. You know, donuts around the flag pole at school, right angle corners in traffic at +40 mph, fast driving on gravel roads where counter steering is a requirement.
So yes, age has effected my driving.