Sounds like you want a busy dashboard. This should help if i am understanding you correctly.
Incidents opened within the past 4 days:
Incidents which have a creation date that is 5 - 9 days old:
Incidents which have a creation date that is 10 - 14 days old:
Etc... Play with the numbers to make sure you get exactly the days you want. I think what i have down might have overlap or might miss a day, so check, check, and triple check the results.