This chart is a scatterplot showing the age of all 189 couples. Each point represents a couple. For example, the point in the lower left represents a 20-year-old man and 19-year-old woman couple. And in the far upper right is an 82-year-old man and 44-year-old woman couple.
Scatterplots like this are often used to get an overall view of the data to see if there are any obvious trends. In the present case it appears that the data points fall along a diagonal line from lower left to upper right. The next step is to explore this and see if there are any differences between men and women, or among age groups.