Pannasami listened without resistance. And sooner or later people grow old and fall ill. Old people are always sick with heart trouble or stomach trouble. They are not healthy any more. Only young people are healthy.
Old age is the cause of sickness, and sickness is the cause of death.
Pannasami was so startled that he laughed right out loud. He had forgotten his question completely, and so the answer had come as a big surprise. When the old sayadaw stopped chuckling, he picked up a teacup and stacked it on another one. This is the stream of arising and passing away. You just keep watching.