More Boomers are aging out of the workforce than there are Gen Zs coming in to replace them. That is a primary driver of the labor shortage.
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This needs context:
Properly stated, Gen whatztheirface Z is a larger group than boomers.
However, boomers that are retiring are retiring with mature skills sets that are more valuable that Gen whatztheirface Z entry-level skillsets.
Also Gen whatztheirface Z and the trailing end of the Millennials haven't hit peak baby-making' age, and this is in the context that younger people that have children are having their children later in life for all the stupid reasons we've all heard before.
Anyway, that is the context of the chart above.
That said, globally we are going to have a contraction in population because throughout the world the boomer generation didn't have as many kids with the exception of India, Mexico, and to some degree the USA. This reflects the slight decline in younger folks, but if we extended the chart, we'd see an uptick in people entering the workforce.
Ironically, it is the Millennials and Gen whatztheirface Z that will save our economy. God help us all, LOL.