I think they do have a higher population of older people? Or something? Like I know there have been articles coming out for years how they don't have enough people of working age to fill jobs or something.
But anyway...older people in the Japanese industry are quite important too.
I mean, Koda comes to my mind first. But last year, I thought it was hilarious when she was on...Best Artist I think, where they show the demographics of the fans...and she had a huge portion of 55-65 year old men
It's not just her of course. She's probably no where near the most popular with the age group.
You can even see this with videos on youtube.
At the end of the day, things are marketed towards the younger generations...but the Japanese market has more to do with tastes than age. And the tastes across the board of all ages, are kind of unanimous. They want idol music.