That's what I gave. Older than one week

Today is the 16th.
To delete the 3rd use < 16 - 7 [3 is less than 9]
To delete the 10th use > 16 - 7 [10 is greater than 9]
To delete the 9th use =< 16 - 7 or < 16 - 6

I left it to the OP to decide if they want to keep Rows that are 8 days old (= Date - 7) because the original formula they gave was "Older than one week and one day."