andy55,

If you seem to sense a slowing down, you should get tested by a driving rehab facility. I do not drive much but when I do, I feel comfortable at 35 mph, any faster and everything is coming at me to fast.

Get tested before you or someone else gets hurt.

The fact that your are aware of your problems means that any accident you cause could easily be considered negligent. It can make a simple injury to someone else into a felony in many states.