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 
Since the sexualization of girls in Japanese media discourse is back, I'm going to plug "Misora Hibari and the Girl Star in Postwar Japanese Cinema” by Deborah Shamoon to remind everyone that this is not unique to Japanese culture and that it's current form has roots in the
occupation of Japan.
yeah I think it's low-key racist when people act like that. as if anglo western media isn't pervaded with sus shit as well.