@Ejoman ^ false. First of all, it's 1988. No version has it as 1987. Second of all, that's not what Japan's age of consent law means. It simply means that a prefecture cannot set their age of consent below 13. And not a single prefecture has it as low as 13. Third, even if that is what "age of consent is 13 in Japan" means, the game explicitly does not take place in Japan. It takes place in "America." AKA not Japan. So, no.
Why is this theory even being debated these days. It has been debunked so, so many times. Ninten is not Ness's father. Ana is not Ness's mother. I've explained in depth on these very forums multiple times why they cannot be Ness's parents with definitive evidence, and yet it just keeps being brought up.