The images in the Google Earth database are of varying ages. Some as new as this year, some as old as 2002. Just click on the 'DG coverage' item at the bottom of the layers menu and you can click on any given year to see what areas are covered in that year.

The GE program itself really has nothing to do with the data coverage and any given spot on earth should appear the same in any version or any level (free, plus, pro, etc) as any other level.