The reason for all the inverted commas in the last sentence is because of the difficulty of working with different definitions of concepts. Young people should be encouraged to find their God-given gifts, develop them and then should be given opportunities to use these gifts, whatever the gifts may be. Young people do not regularly minister to adults, either at adult small groups or in church services. If it is true that our spiritual ability comes not by might, nor power, but by God's empowering Spirit, and if it is true that it is the Holy Spirit who gives gifts, then age should not be a factor when it comes to utilizing one's gifts. They get the full power of the Holy Spirit, and should be given ministry opportunities on this basis.
Adults are a lot more forgiving than teenagers.
Adults are also a lot more discerning than young people, and have the ability to distinguish between good and bad ministry. It seems strange then that we persist with using the youth ministry as a training ground. We should use adult ministry as a training ground, and only the very best leaders should be allowed to lead in the youth ministry. I personally believe that allowing untrained, spiritually immature people loose in youth ministry is one of the key reasons that youth ministry is failing in our churches. Most youth ministries' biggest complaints is the lack of finances, which shows the level of commitment the church actually gives to it.