Though English, the expression "parasite singles" originated in [?] and is used to refer to unmarried people in their twenties or older who still live with their [?]. According to the media, these children live carefree and comfortable lives at their parents' expense, or at least did so until the publication of Professor Masahiro Yamada's book, "Parasaito shingeru no jidai" in 1999. What Yamada's book did was to draw attention to the 10 million-or so "parasite singles" in Japan and give them a [?] image. Some statistics, for example, say that up to 85% of "parasite singles" do not pay any rent or living expenses, and 50% still receive [?] from their parents. Nevertheless, the reality of the situation may not be so simple- many parents actually want their children to live with them until they [?], seeing the extra financial cost as an investment for the day when, in old age, they must be looked after themselves.