Why are jdramas more open with large age gaps than kdramas?

i'm curious now. can anyone recommend me jdramas with age gap between leads? jdramas i've seen so far always have leads in similar age...

 autumn iris:

iirc (avoiding taboo relationship):

Jimi ni Sugoi! Koetsu Garu Kono Etsuko (older woman)

Koi wa Tsuzuku yo Doko Made mo (younger woman)

Last Cinderella (older woman)

Tokyo Tarareba Musume (older woman)

Watashi ni Unmei no Koi Nante Arienaitte Omotteta (younger woman)

thanks! i'll try overcome my harsh prejudice on these jdrama posters lol 

 autumn iris:

You're welcome.

Actually it reminds me that I also have an older woman-younger man romance drama on my ptw list: Hoshi Furu Yoru ni. It has different relationship dynamic compared to the other drama I mentioned before. As Yoshitaka Yuriko always has this cute childish charm in her (imo), and ML who has hearing and speech impairment seems mature and caring (so far, just started watching it).

Why so many older woman ones? 

My thread was directed at older men x young woman relationships which is what people tend to hate. 

 anroremo:

That's why I prefer Jdramas over Kdramas nowadays, I was an avid watcher of kdramas until I started watching japanese dramas with a lot of mature content, make me feel that they are more in touch with humankind. I love the age gap dramas and eventhough sometimes they are portrayed a little bit harsher when the love interest is the woman being older, they endup doing a great job justifying the relationship and even most of the time giving the story a happy ending. I absolutely love "The Last Cinderella" for example. 

I have been watching Jdramas for 2 years now. I will add "The Last Cinderella" to my watch list.