Last Oct, my DD-15, her best friend-15 and my little sister-25 went to BBB. They just did the hair and makeup and were treated GREAT. I asked the manager if they were the oldest girls to come in and she told me most certainly not, they've had bridal parties and older women, etc. The girls wore their sashes and hairdo's to MGM and 50's Prime Time Cafe and were complimented by everybody! They had a great time with it.
If your DD likes a lot of attention, then go for it. If she's shy, then maybe not.