The next time you hear someone say that young people are the church of tomorrow, jab them in the ribs. Very hard. Twice. If there are young people in your church at the moment, they are the church of today. They might be the leaders of the church of tomorrow, but right now, they are the church of today.
After all, if they are Christians, they are part of God's family, now. God doesn't give them hoops to jump through. They don't have to wait until they are 18, or 21, or have got married and had children, or been baptised, or confirmed, or have been to church a certain number of Sundays-on the trot.
As far as God's concerned, they don't have to wait for anything to be part of his family once they have accepted to live with Jesus as their Lord and Saviour. If they do have to wait for anything it's because we have provided a hoop of legalism for them to jump through, not God.