I changed mine about five years ago when they were still starting to computerize. Ewan ko ngayon ha, pero I just paid a penalty (with receipt) and they corrected the birthdate.
1 year talaga yan, ala ka magagawa dyan. i cheated 7 yrs sakin (dad ko kasi sinobrahan yung type sa fake birth certificate ko) 1982 to 1975, grade 6 pa lang ako may student permit na ko. well it was my mom's doing, she wanted a weekend driver and i loved driving. may kakilala kami anak ng head ng LTO sa province so we tried to apply for a new license there, mayabang yung anak kaya daw nya ayusin kahit same name i apply namin. ayun nahuli! 1 yr ako ala license. sympre napahiya yung anak so for 1 yr he gave me an authentic non-pro license card na sympre alang papers from his father's office, then after a yr inayos nya ok na. but now every time i renew my license pag dating dun sa verification line i have to wait so long, ang lagi sabihin sakin "sir, paki intay lang po ha, conflict po kasi, 3 po kayo na may same name." i'm guessing 3 kasi, 1 yung may fake birhtdate, 2 yung inapply namin sa province at 3 yung hawak ko ngayon hehe. anyway its probably the price i have to pay every renewal for cheating.
i knew a co-worker who had the same problem... he waited until it expired then went to the provice to have it renewed and had his bday changed to the correct date... of course he gave the fixer a little bit more... but this happened maybe 7 years ago...