Just of curiosity: Where does Ann Stanley Dunham’s underage (18 years) to be able of confer citizenship to her son fit into this equation???
Just out of curiosity - have you not read the immigration law?
Oh, and try using a calculator
But there is no age of mother requirement for NBC status for births within the US, only to meet statutory citizenship requirements for a foreign birth.
Obama would not be NBC, unless you are Ruth Bader Ginsberg and friends, if he was born outside the US to a US citizen, so age or marriage status of Stanley Ann wouldn't matter for POTUS eligibility.