Is 70 the age to stop towing

I would prefer to ride with the 47 year old who can still see, hear, feel, and react quickly to a situation. We have "safe" older drivers who rip along in the center lane at 47 mph on the freeway where everyone else is driving at the posted 70 mph. "They" are the only ones who think they are safe. At 76, I don't kid myself that slow is always safe or that I have the talent that I had thirty years ago. Do some mental and physical tests if you don't believe me. Some of my older friends forget why they got in the car in the first place. Yours may be different, but I doubt it.