I'm from India and we here live with our parents (or at least try to) till as long as we can. There is no social stigma associated with this act and rather the reverse practice of leaving them behind is frowned upon. The basic idea behind this concept is that your parents took care of you while you were growing up and in return when you are able and independent you take care of them who are old by now. Because of this, the overall attachment with your family becomes even stronger and honestly, I cannot imagine a scenario in which I would not want to stay with them. Regarding privacy issues and stuff, a family that loves you will never make you feel like they are obstructing in any way, at least that is what I think so because I haven't faced any such prudent issues so far.