Perhaps you can answer a question I would ask him. My quality of life is hugely improved by things for which I pay nothing, e.g. the information freely available online. Do his calculations take into account things which don't register as standard economic activity?
I would guess that if you looked at the time it takes someone to learn a new skill you'd have a metric showing an even faster improvement than the total productivity gains of the baby boom generation.
He talks about some remarkable things about GDP and how the economic numbers don't capture improvements early on. For instance cars were not looked at in terms of inflation in the US until 1935.
Total Factor Productivity is looked at extensively.
I would guess that if you looked at the time it takes someone to learn a new skill you'd have a metric showing an even faster improvement than the total productivity gains of the baby boom generation.