Your older dog is just a special today as he was when he was a young pup. However, his behaviors and his reactions are going to be quite different as he ages. Your older dog might not hear as well as he used to. He also might not see you as well. His reflexes are going to be a bit slower. Just as you have had to do his entire life, you need to keep your older dog safe. Training him to stay out of the street is important at any age. If you have rescued an older dog or your environment is new to him, he will need to be trained to know where he is safe and where he is not. Remember, with an older dog, because his senses are a bit different and his reaction times are slower, you will need to spend some time teaching him to stay out of the street, especially if he now lives near one.
Staying out of the street will require your older dog to remain focused and pay attention to his surroundings even if he can't see or hear as well as he used to. You can spend some time with your older dog on a leash showing him the street, teaching him to look both ways should he need to cross, and understanding the boundaries to keep him safe. Your older dog will respond best to positive enforcement training rather than consequence training relying on items like shock collars. With lots of repetition and introduction to the road and the dangers of cars, you can train an older dog to stay away from the street. Training your older dog to stay away from cars as well as out of the street altogether will help to keep your dog safe in his later years.
To train your older dog to stay out of the street, you are going to need a harness and leash or a leash and collar. Be sure to bring lots of high-value treats during your training sessions, and when you and your dog are outside, have treats on hand to reward him for those good choices he'll make after initial training. If your older dog is used to using a clicker to train, be sure to bring a clicker with you. He will recognize the click and reward that comes with this training if you have the clicker in your hand during your sessions. Be patient and always be on guard, so he doesn't get hurt during your training.