A Will does not expire due to age or length of time since it was executed. There are very specific procedures required to void a will. If these formalities were not used, the Will is presumably valid, if valid at time of execution. A Will, as we say in law, “walks with the testator”–that means it is valid, but not enforceable until the testator passes.
If you have a copy of the will, I suggest you take it to a local estate’s attorney. If you do not have a copy, you can do a will search in the probate court where the decedent lived or was living at the time of the writing. If neither of these are an option, you will have a harder time locating the will, if it still exists. The decedent may have destroyed it or written a new will once married. If you know the lawyer who may have drafted the Will, try to contact him/her.
If no will can be located, the court may distribute under “Intestacy” succession–which is a scheme set out by the state to distribute property of a person who died without a will.
Speak to an attorney who can assist you in locating the will and what options exist in the absence of a will.