International directory enquiries dissertations There have been numerous studies in recent years that indicate the importance of social interactions as we age, and one of the reasons that retirement might be hazardous to your health is that you could lose a major source of social interaction once you no longer have a job. 必須 2000文字以内 [bbs:youtube:(Youtubeの動画ID)]と書くとYoutubeの動画が貼れます。(例:[bbs:youtube:OQThUAQ0UN0])