Japanese women always seem to look younger than their years, to me.
The original twins from "Mothra" (1961) were an actual singing duo...they worked under the name "The Peanuts" in Japan.
It's kind of funny...in a recent G-film, GMK, Mothra shows up, but the singing twins do not, as it was a far more serious and violent movie. However, at one point, Mothra flies low over a street, and two teenaged twin girls are shown looking up at her and smiling to each other knowingly.
I'm SOOO glad they left the '70s style of having the little boy in the MEGA-tight shorts always hanging around.
Of course, we all prefer the ladies. MUCH easier on the eyes.