Not just 80's - kids born in 2013 also get their birth certificates without a name on it (unless you provide a name as soon as kid is born).
One can always get a name added to birth certificate anytime. I was born in 1980 and got my name added this year. My son is 2013 born and I got his name added a few days back..no hassles..just follow the standard procedure of Municipal Corporation.
I used to have a hand written birth certificate on preprinted stationary and now that they moved to computerised environment they gave me a printed certificate with my name mentioned on it and the certificate also refers to their records of both manual and computerised serial numbers.
Processing Time : 10 days and if you have personal links it does not take more than 2 days. (I got mine in 3 hours
)