What I wanted to tell with the above is, in our society, particularly decades ago when it was just natural for women to become housewives and seldom had to work, people would tend to feel OK for men to prefer younger women, and would feel not so OK for women to perfer younger men...
For instance, a celebrity is dating with a girl, say, 20 years younger, people would say with envies, "Wow, what a lucky guy he is!" Then a female celebrity is going to marry a boy, 12 years younger, people would say with embarrassments, "Oh, that young?"
Well, a lot of things have changed since then, of course! "How lucky she is!", one of my friedns said when she learned that Madonna dating with A-Rod yeas ago. But for older people, they might still take it unappopriate.
For that matter, and as let's talk mentioned below (about spending their husband's income to chase Daisuke around the world), these aunties would want to hide their love for young Dai from their husbands.
Oh, and fyi, there aren't only aunties for Dai over here; but many other women who would claim themselves Dai's mommies and big sisters.
Dai and Nobu attract many fans who are older, due to their personalities; motherly love, do you say in English? As let's talk says, Dai also has so many young fans, too, but they just can not afford tickets to every competitions Dai enters, air fares, hotels overseas and time.
For Taka and Yuzuru, I would say, they have more fans who are probably in their teens and twenties.