Youth Leading in Workshops
When our girls were younger, I used take them out on workshop trips (as their school or holidays permitted). On one occasion we were flying through London and my oldest (aged 17) got into telling the "One Leper" story (Mark 1:40-45) to a family. As we discussed being unclean in that story, a girl beset daily with strong fits--a minimum of two every day, often more--went into a bad one. We prayed for her and she was delivered of several demons. Several years later that family testified that the girl had not had one single fit since that night.
On another occasion all three daughters helped us lead small groups in an STS workshop in the Peru. Our youngest daughter was only twelve at the time and capably led a group of men from a remote tribal group deep in the Amazon.
At one point during that workshop, a man fell from a home built on stilts. The man was seriously injured. I asked our middle daughter (aged 15), who like her sisters had learned three Bible stories for the trip, to tell the story about the young man who fell from a window when Paul was preaching (in Acts). God worked through that story and by His Spirit to bring healing to the Amazonian man who had fallen. The whole village heard and saw the miracle.
My youngest, when she was 15 years old, also helped lead small groups in local workshops I led in Ireland. That year, she also travelled with me to lead small groups and present illustrations when we led several training events in Egypt.