If the toilet is as old as you say it is, it may be a better idea to replace the entire assembly inside the tank. I would bring the old flapper into the hardware store with you, and if you have trouble finding the right one, just buy a kit and replace it all. If you can use a wrench it's not that difficult. It'll come with step by step instructions on how to replace it.
And while you have the water off and the tank empty, clean around the opening real well to make sure the new flapper will make a good seal.
Good luck to ya.
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