There is no trend for any of the four age-groups before 2012, but then the youngest group (which Gen Z begins to enter in 2014) starts to rise sharply. The next-older group (mostly millennials) rises too, though not as much, and the two oldest groups are relatively flat: a slight rise for Gen X (born 1965–1980) and a slight decrease for the baby boomers (born 1946–1964).
