what is the criteria for displaying invalid data in a list?

I have an App that is holding a list of gas stations and those can be sorted by Price so the user can see first the ones with cheaper prices...

now, the requirement is that if the price I get from web-server is older than 2 days it must be somehow displayed in another way...

I was thinking:

  1. changing the color of the price (they said is not valid since the text color must be the same always)
  2. adding an info mark like 1.33$ * (they said is not valid since i need to add a new line at the end explaining what that means)
  3. moving those prices to the bottom of the list and somehow strike them like 1,35 $

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but am not sure which of those options is the best one for the UX-UI...

thanks

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