We sent pledge cards for every member of the family, including the children. Children are asked to give because it teaches them how to be generous with God. You see, the same thing is true for adults. We have to learn to be generous with God. We give not because the church needs it, but because we need it.
Teenagers have to learn to tithe from their allowance.
Again, it is not so much because the church needs their few dollars, but because teenagers need to learn not to spend all their money on themselves. A modern teenager may have more discretionary money than many adults. After all, every bit of their money is discretionary. Young married couples have to make important decisions about their money. Differences in attitudes about money cause as much conflict in young marriages as any other single item.