It would be helpful Linda if you told us what bindings you have. There is a good chance, if the skis are 20 years old, that they are 3 pin bindings. Some other types of bindings though, have changed. If you don't know what those are, look at the binding and if they have 3 pins sticking up into the space where the sole of the boot goes, then it is 3 pin. And those are available. Go to Mountain Equipment Co-op on King east of Spadina. The staff there are very knowledgable and don't give you a bullshit story just to sell you a new pair of skis. They don't work on commission, and the store is a member run co-op. Their mandate is not to maximize profits but rather to serve the members (membership costs $5)
Other comments about buying new bindings and re-drilling your skis are correct.
Let me know if you have any other questions. Good lick. -Q-