At What Age Are Sleepovers Appropriate?

Mother continues to read from The Christian Mother and The Christian Father, and answers questions from: Debbie, who's concerned about motorcycle culture and lack of reverence;  Rob, who's confused about the death penalty;  Rafael, who is upset about a sacrilegious ad campaign by David Protein Bars;  Paula, who's wondering about male modesty compared to female modesty;  Stacy, who'd like to know at what age sleepovers are appropriate;  Stephen, who is dealing with older children who reject the faith;  and Ann, who would love to know Mother's favorite Marian apparitions.