Normally, flower girls age are below 8 years old. If your daughter or niece is older than 8 years old, she is not suit as flower girl anymore, but you still want she participate wedding party, then you can consider she as junior bridesmaid. The ages of junior bridesmaids are from 8-14 years old. They usually being around when the bride is wearing along tailed gown. What kind of dress to wear? Junior bridesmaid dress should at least similar with bridesmaid dresses. Of cause, the dress you can according the face to give a little change. For example, you can add a short sleeve, add straps or change the length. It depends on you.