I missed in the article what is the percentage in other countries making Japan special with 20%.

Btw. is there something wrong with it, if parents and the men are fine with that, what's the problem here? At least parents will have someone to take care of them, my wife's uncle is in similar position and I don't see it as anything bad, at least other children with better jobs no need to take care of them. Or the preffered option is to dump own parents to retirement home and stay in your own apartment, if someone has no problem with the other option?