Okay, it will be more like 13 years of fame when Adam Smith's portrait goes off of the Bank of England £20 note in 2020 (it first appeared in 2007).
That’s not a bad run, considered Smith bumped Sir Edward Elgar off. And considering that Smith was a Scot, and that the Scottish National Party just won big in the latest UK elections, his portrait might get off just in time. The new note will showcase a person from the arts, selected and designed in part with the public’s help.
Changing pictures on the bills may be expensive, but affords lots of opportunity for seignorage—as people fondly store these notes away, never to be spent. It’s a nice racket, if you can get it.