Language is a slippery thing. Just when you think you have it pretty much in hand, it slithers away.
At least it has been that way for more than 200 years.
At least it has been that way for over 200 years.
For a very long time language purists have insisted on using more than rather than over when referring to quantity.
Fussy news editor: More than 20 people were arrested.
The hoi polloi: Over 20 people were arrested.