This is why time seems to go by more quickly as we get older

A worker adjusts clocks displaying the time in London, Hong Kong, Seoul and New York as screens (bottom) show the composite price index of stocks (L) and exchange rates between the U.S. dollar and the Korean won at a dealing room of the Korea Exchange Bank in Seoul December 15, 2008. Asian stocks climbed nearly 4 percent on Monday on renewed hopes the U.S. automaker industry would be rescued, strengthening willingness to take risks and knocking the U.S. dollar to a two-month low against the euro. South Korea's benchmark KOSPI .KS11 share average was up 4.9 percent.

There are several theories which attempt to explain why our perception of time speeds upas we get older. Image: REUTERS/Jo Yong-Hak

Christian Yates
Lecturer in Mathematical Biology, University of Bath
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