Created or last accessed? Created will be impossible since inodes don't store file reation time, just access time, modification time, and status change time[1]. Read the man page to find, something like:
find . -mtime +10 -mtime -20
will print out a list of files modified between 10 and twenty days ago; add the appropriate -exec switch to remove them (be careful it's working right before doing this!) and you're set.
[1] Status change time is often the creation time, but it can't be relied on.
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