Question

Are there existing solutions to delete any files older than x days?

Answer 1

Amazon has introduced object expiration recently.

Amazon S3 Announces Object Expiration

Amazon S3 announced a new
feature, Object Expiration that allows you to schedule the deletion of
your objects after a pre-defined time period. Using Object Expiration
to schedule periodic removal of objects eliminates the need for you
to identify objects for deletion and submit delete requests to Amazon
S3.

You can define Object Expiration rules for a set of objects in
your bucket. Each Object Expiration rule allows you to specify a
prefix and an expiration period in days. The prefix field (e.g.
logs/) identifies the object(s) subject to the expiration rule, and
the expiration period specifies the number of days from creation date
(i.e. age) after which object(s) should be removed. Once the objects
are past their expiration date, they will be queued for deletion. You
will not be billed for storage for objects on or after their
expiration date.