Possession for purposes of confirmation of imperfect title shortened under new law

Dear PAO,

I acquired land from a family who occupied the same land sometime in 1970. The seller had declared the land for taxation purposes, but he never tried to apply for its registration because of so many requirements. I am now consulting someone because I want to file a petition in court for the registration of the land in my name, but I was dismayed when I was informed that my possession, including that of the seller, should be counted from June 12, 1945. Allegedly, I am not a qualified applicant, considering that the proof of possession, which was the tax declarations, started only in 1970.