My wife’s sisters and brothers finally got their mom a 'very very very late registered' birth certificate. They recon she was born sometime in the late 1960's. There are absolutely zero records of her existence in the world before the late 1990's and there are so many discrepancies about her birth date I am convinced no one really knows when she actually born and there is ZERO possibility anyone could ever find out a correct date.
Neither my wife or myself were directly involved getting her late registered but I asked my wife and she said it was basically a number of in-person visits to the LCR where they would keep rejecting stuff and asking for something more. Eventually they got enough to make the LCR happy and they issued the late registered birth certificate. It was a maddening exercise in typical Philippine bureaucracy. You just have to go back and forth with the LCR until they are satisfied.
In classic Philippine style when she finally got her birth certificate it had her name misspelled in a way that did not even correlate to any of the multiple misspellings on her other documents.
I asked about the affidavits and my wife said it was persons who I know are family friends. I'm not sure they are technically legit as a "disinterested persons” but it satisfied the LCR. They were younger than her so age of the affiants didn’t seem to be a problem. was not a problem. Maybe they just need to be mature adults, like 40+y/o or something.
From previous decades there are huge numbers of older Filipinos, possibly even millions, who were born at home and their parents never registered the birth. Parents saw it as a hassle, it cost a small fee, and they just saw no useful purpose or need of having birth certificates for their children. Housewives, farmers and others living in the province who work for cash, very easily live their whole lives with no one ever asking about a silly birth certificate. More recently they are getting more strict about it but there are still plenty of children out there that don't don't get registered until they are old enough enroll in school, or even later.