As a kid I assumed no one knew how old these two were because they were mysterious ninjas, but it turns out Tecmo just redacted their ages in the English translation for obvious reasons. It's funny they went with this route instead of just bumping both characters up to 18 years old. I guess Tomonobu Itagaki refused to tamper with the sanctity of his precious DOA canon 
spoiler
I'm sad to report the PS2 version of DOA2 seems to be one of those early PS2 games that's interlaced to hell and back and will look like a jagged mess no matter how much you upscale it in PCSX2 
Just as a reminder, this is the director for this game:
The Japanese Tommy Wiseau
I want to see a The Room Japanese dub
Even that guy somehow manages to look more menacing than katana and trenchcoat Ben Shapiro.
While you were busy studying the p-word, I studied the blade.
As a card-carrying sword lesbian, i feel confident to say that he comes off as equally clueless about vulvas and blades.