My birth father (a bush pilot in Canada) was 48 while my birth mother was 16. I actually got to meet her. Cool old lady but very talkative. :)
But I have known no other mother than my adoptive mother. I mean, I was adopted before I turned 1 year old. So, my Mom is my Mom. My birth mother was just an old lady who yammered more than I do and had (RIP) the same blood type as I do.