I'm also retired, now 85, but still drive an average of 800 miles per month (14533 miles since April 21).
I have to say, I would be lost without my car.
You might say, Where do I go? Well mostly local mileage, with the occasional trip to one of my daughters, (240 mile round trip)
Fortunately. with the MPG returned by the Mk4 Jazz, such trips are still possible, in the current financial climate.
Current average over the 14k miles has dropped a bit, with the onset of winter, but still showing 68.3mpg.
I remember when I had a 1975 Rover 3500s, where the mpg was around a 1/3rd of that