nonidentifying info, is it the truth or not?

I was wondering, do you think the nonidentifying info that you send your money for is the truth because My adopted mom told me many years ago that my birth mom was around 30 when she had me, and different stuff, but when I contacted the agency to ask her name and age and stuff they told me that she was 25 and told me her name first name only but, for some reason, I don't beleive this info, they also told me that I would have to pay for the rest of the nonidentifying info file. Do you think that they alter this some what and why, did anyone eles gets false info? I just don't know if I want to waste my money and it not be the truth. what would you do? Thanks for listening. from Mississippi.