Session 1 Japanese Household Demographics

During yesterday's lecture, I curious about why now 1/3 of all Japanese housholds consist of only one person. In Aziz Ansari's book, Modern Romance, he uses Japan as a case study for loneliness and largely attributed the decrease in dating, marriages, and childbirth to extreme work stress and business, so I wondered if these are in fact the primary casues of more people living alone than in the past, or if there are other factors that have led to this demographic change. For instance, does the fact that the population's aging and fewer people are choosing to live in three-generation households mean that more elderly Japanese are living on their own or in senior facilitites? Or is decreased romantic partnership among the younger generations the primary cause of this trend?