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This already exists, downvoted and closed questions will usually be removed automatically.

The exact criteria are listed in this post on Meta Stack Exchange:

Just to formally document the exact policies we have in place to remove old abandoned / dead questions, the Community user will delete questions in the following circumstances:

If the question is more than 30 days old, and ...

• has −1 or lower score
• has no answers
• is not locked

...or...

• it was closed and migrated to a different site

... it will be automatically deleted. Internally, these are termed "dead" questions (RemoveDeadQuestions, or RemoveMigrationStubs in the case of a migration).

If the question is more than 365 days old, and ...

• has a score of 0, or a score of 1 in case of deleted owner
• has no answers
• is not locked
• has view count <= the age of the question in days times 1.5
• has 1 or 0 comments

... it will be automatically deleted. These are "abandoned" questions (RemoveAbandonedQuestions).

These checks are run every week across all sites.

If the question was closed more than 9 days ago, and ...

• not closed as a duplicate
• has a score of 0 or less
• is not locked
• has no answers with a score > 0
• has no accepted answer
• has no pending reopen votes
• has not been edited in the past 9 days

... it will be automatically deleted. These are "abandoned closed", and show as RemoveAbandonedClosed:

This check is run every day across all sites.

See also: The official "How does deleting work? What can cause a post to be deleted, and what does that actually mean?" FAQ meta post.