Young children go to the nursery. The next age group attends the children's program. The pre-teens and early teens have their own arena. The youth segregate themselves into their own events. Young adults find people who share their problems.
Singles have their own peer group.
Senior citizens meet for missions and prayer and fellowship. These sub-groups have very little idea of what the others are doing. Often they do not communicate with each other. The church for them is the life and ministry of the sub-group. In most churches there is no place where children and parents and even grandparents can meet, get to know each other, and serve together in Christian ministry.