You still don't get it. You can't replace the larger generation with the smaller upcoming generation. The physical demographics aren't there. It's why they were called Boomers. It's also why there is record low unemployment. Companies knew about this for years.
Let me visualize it for you. See the labor participation of those under 65 in the chart below (the lightly color lines) and see those 65 and older (the dark color lines). Now you see the negative numbers on the left that represent the percentage. You see how those 65 and older are around -8% whereas the others are around -1%. That's who is dropping out of the labor force. Hint: it's not the 35 year olds.
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