My son is 5 and still sleep with us. My friends keep telling me that we have to make him sleep alone. But i am confused. What will b right age to get him to sleep alone.

Personally, I don't think there is any "right" age with regard to this. It probably depends on whether you (and your husband) and your child are ready for the transition. If you think it's time, then you can try getting him to sleep in his own room. Some of my friends made the decision when their children requested to have their own beds (around 4 or 5 I think). And some simply thought it is good so that they (the parents) can have some space and also, to help their children be a little more independent.