The chart based on data from CDC 2015 provides an example of tracking three trends over time.
The bars indicate the percentage of births to unmarried women. The upper teal line represents the median age at first marriage and the orange broken line indicates median age at first birth.
Notice the "crossover" of the two lines referring to first birth and first marriage.
Note also the stabalized trend for births to unmarried women easily visible on the bar portion of the chart. About 40% of women are unmarried when their children are born.
You can read text related to the story at the BGSU weblink:
https://www.bgsu.edu/ncfmr/resources/data/family-profiles/eickmeyer-payne-brown-manning-crossover-age-first-marriage-birth-fp-17-22.html
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Geoffrey W. Sutton www.suttong.com
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