I teach different categories of idioms every month in our center's English Corner. This month I chose the topic 'Age'. I thought this would be a fun song to discuss and listen to. I started the hour by having the students, first define what an idiom was, and then to discuss (in English) the different idioms they knew in their own language that were related to age. Then I gave them a gap-fill of idioms about age, followed by a ppt with the answers. After we finished those activities, we moved on to this song. The first part is a phrase match, followed by a gap-fill. I've also included the lyrics in large type. They can be cut into strips for various activities as the teacher chooses.
