A Last Will & Testament does not need to list specific assets correctly to be valid, nor does the age of the Will have much to do with its authenticity or validity.
Many wills provide bequests that are general in nature. For example, language such as “the balance of my personal property to my sons, A and B.”
Bequests that list specific assets that are no longer in the estate are disregarded, unless there is very specific language in the Will providing for an equalization of distribution among all beneficiaries of current estate assets.
Typically, when the Will is reviewed by the Probate Court prior to the authorization of asset distribution, these issues are examined closely by the judge.