More cynical experimenters say that the golden age of theory is over, now that the days of freewheeling mathematical carousing are drawing to a close.
The theory brings to mind New Age crankery, and some of the research Mr Flannery cites to underpin it is speculative at best.
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"Marketing theory isn't affected by age bias, but marketers themselves are, " Stroud writes, blaming the bias on a marketing industry population that skews under 35 on the lack of an institutional commitment to break out of a comfort zone.
The hiatus in air travel could be a rehearsal for a post-jet age if the peak oil theory is correct and we are facing a future with insufficient fuel to put into planes.
Muslim theology might, in theory, allow for some flexibility in the age of circumcision.
In theory all the rich data on Facebook-- such as age, gender, geography, schooling, entertainment tastes and brand preferences--are available to marketers whose customers give them permission to see their personal data.
The government has said that it intends to raise the pension age if life expectancy keeps increasing, so the sky could be the limit in theory!
If you pay someone to watch your qualifying child or dependent (generally, a child under age 13) while you work or look for work, you can, in theory claim the Child and Dependent Care Credit.
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When a job becomes available, someone who claimed Social Security at 62 can, in theory, return to work and pay back benefits received without interest, then wait until a later age to claim a higher check.
Although Riemann, who died at the age of only 39, also laid the foundations in geometry for Einstein's general theory of relativity, his paper on prime sattracted little attention in the decades after it was first published.
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