A friend turned me on to a blog by Justin Taylor called Between Two Worlds. He posted part of an interview with J. I. Packer on worship. I thought it was very insightful.
"We have separated the ages, very much to the loss of each age. In the New Testament, the Christian church is an all-age community, and in real life the experience of the family to look no further should convince us that the interaction of the ages is enriching. The principle is that generations should be mixed up in the church for the glory of God. That doesn't mean we shouldn't disciple groups of people of the same age or the same sex separately from time to time. That's a good thing to do. But for the most part, the right thing is the mixed community in which everybody is making the effort to understand and empathize with all the other people in the other age groups. Make the effort is the key phrase here. Older people tend not to make the effort to understand younger people, and younger people are actually encouraged not to make the effort to understand older people. That's a loss of a crucial Christian value in my judgment. If worship styles are so fixed that what's being offered fits the expectations, the hopes, even the prejudices, of any one of these groups as opposed to the others, I don't believe the worship style glorifies God, and some change, some reformation, some adjustment, and some enlargement of spiritual vision is really called for."
I read another great quote on preaching from the quotable Howard Hendricks . He says:
"It is not too difficult to be biblical if you don't care about being relevant; it is not difficult to be relevant if you don't care about being biblical. But if you want to be both biblical and relevant in your teaching, it is a very difficult task indeed."