How to Delete Old Comments by Date?

I run a contest/giveaway blog at www.mommylivingthelifeofriley.com and currently have over 160,000 comments on 1100 posts. I would like to find a way to delete all comments from my site which are older than 6 months, so as to improve my site’s overall performance. Does anyone have any ideas on how to accomplish this? Thanks for your help!

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