Some churches in America are comprised of essentially a single generation. Some become this way through changing neighborhood demographics and others intentionally target an age group for a new church start. The religious establishment encourages targeted evangelism as an effective means of church growth and the popular target is usually the under 40 crowd. In fact, if you reach people under 40 in large enough numbers you will be admired by your peers and celebrated by the religious establishment. You can write a book and hold seminars.
Churches that are primarily composed of people over 60 are perceived to be dying and many actually are. Emerging leaders often lack the patience to communicate with these churches and are frustrated when their advice is not taken. While it's true that many over 60 fail to see a need for change, many under 40 fail to see the unintended consequences that change can bring. Both sides of the generational divide must reach across the aisle and work together for the sake of the gospel.
Senior adults built our church buildings and invested their lives in ministry. They deserve respect. Their presence and wisdom are valuable.
Young adults deserve to be heard as well. They have much to offer, including insights on reaching others their age. Many young pastors lament the fact that their generation has no place in the established church.
Thriving churches have children running around and adults of all ages working and worshiping together. At some point thriving churches decide to intentionally place the gospel above personal preferences. At some point thriving churches learn that church is more than the right name and a cherished worship style. At some point thriving churches shift their focus away from self and toward God and the world he loved so much that he sent His only son to save it.