Until we come to grips with what will likely be a post-labor world, this is a good transitional approach. The 40 hour week is an arbitrary standard, and it may now be rational to reduce that number. Few jobs are now so arduous that 70 year olds cannot perform well. We are suffering from outdated standards for work weeks and retirement age, and un-sticking our assumptions is likely to benefit the situation.
> Few jobs are now so arduous that 70 year olds cannot perform well. I think it's mostly physical jobs that 70 year olds cannot perform well. And that kind of job can be automated by robots anyway. For job like programming or CEO, I kind of think that 70 year olds can do better than say 20 year olds.
Maybe in 50 years, but currently I'd say a 20-30 years old is the prime programmer age. Young people tend to learn new tech quicker, and be faster/more efficient at typing and using computers.