I have had one for many years. It is forever, and yet every four years I need to get Doc to sign a new one. All of mine would sign. I too, can't walk very far. I don't think you would have any trouble. This time of the year, we don't get to use them everytime we go shopping tho. At Christmas, it seems everybody has one. If you can get a permanet one, get a plate and a placard. that way you have it when you are in someone else's car. They don't charge for them.
Billie