x-wife dies no will no beneficiary has life ins with massmutual worth thy say 25000 ? she died in 1991 naverremarred

It's not clear at all what your question is. If this is your ex-wife, you would only be entitled to any life insurance proceeds if you were still designated as her beneficiary specifically, by name and not by the relationship of "spouse," at the time of her death. I suspect that someone would have contacted you by now if her death occurred in 1991 if you had been entitled to anything.