Hi Jenn,
Definitely each listing will have different amounts older / new
listings as we get our data from many providers.
Using the CityGrid Reviews API (
http://docs.citygridmedia.com/display/
citygridv2/Reviews+API#ReviewsAPI-SearchUsingWhere) one of the
properties you can pass in is "days", which is the maximum age in days
for the reviews. For example, supplying 14 will restrict the results
to reviews which have been posted within the last 14 days.
Hope that helps gets the results your looking for.
Kin Lane
@citygridapiteam