Bedbug Lifespan: 2 Months or 18 Months?

I was doing some research on bedbugs and came across this article:
http://www.wired.com/wiredscience/2009/12/diy-bed-bug-detector/

The interesting part was that bedbugs may have a shoter lifespan than 18 months:

On the bright side though, Polanco-Pinzón reported at the meeting that her survival tests found that a pesticide-resistant strain she collected from Richmond, Va., lived at most two months without feeding. That record, set by the fifth stage of the immature bugs, falls far short of the year and a half reported in the old literature.