The pensioner from Kingston upon Thames was arrested at a home in Southampton Street when police carried out a raid yesterday afternoon.
Another woman found at the home was also arrested and has been handed over to the UK Border Agency.
Officers carried out the warrant at around 3pm in the afternoon and also spoke with a man at the property who assisted their enquiries but was not arrested.
The 73-year-old was arrested on suspicion of keeping or managing a brothel used for prostitution and was bailed until June 14.
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