That is a reasonable statement, but let me give you the flip side. Millennials are a bigger generation than Baby Boomers, at least at the moment. The labor force keeps growing. While we do have more older people per worker, that is because the number of older people keeps expanding.
Baby Boomers were called the Me Generation, because they are selfish. Millennials can be selfish too, but they are also hard working when they want to be.
On the far more theoretical side: The Economist Solow said, "computers are everywhere, except for in the productivity statistics", or something like that. He said it back during the 1980's, and computers have contributed more to productivity since then. But the basic point still stands, that computers have contributed less to productivity than would be expected. Maybe the problem is that older people cannot use computers well. There is a theory that we will see a huge bump in productivity when we get the Baby Boomers out of leadership.