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公民为 九十岁母亲(父亲已去世)做亲属移民。 母亲在和我父亲结婚之前很久， 大概1960年离过一次婚， 但是所有的文件都找不到了， 可不可以填I-130时不申报这个前配偶, 谢谢！

-You may just put the information in I-485 and explain in Part 14 Additional Information of I-485 that "I missed my marriage certificate and divorce certificate from my first marriage because it took place more than 60 years ago". Then, also explain it during the interview if the immigration oficer asks this question. No big deal, anyway.