Considering my Wife is Japanese, and is from Japan, I would agree in saying the Japanese Culture is Very different than the US/UK/UE/ or anywhere else, But theres nothing "Kitchy" or childish about it. Japanese culture would be more family orientated and business like then anything else.
A lot of there culture is put into the things they make, wether it be Cars, Anime, Movies , Clothes etc Age is not important at all, There is a type of honor system there, but not as extreme US/EU movies seem to make it.
But if you really want to know whats its really like there, Then Super8 would be the one to ask, Ive been there plenty of times during the holidays with my wife, But I don't live there.
And I don't see the GT-R feeling more mechanical then anycar on todays market...
Nissan wasn't aiming at the younger generation of people, Not with a car like the GT-R, Not with a 70k Pircetag.. With cars like the Silvia and the Z cars, those were the younger audience cars, everything else was for your average working masses.