The entrepreneurial pensioner was caught out in Sucy-en-Brie, south-west of Paris, when police officers stopped her car on Tuesday morning.
Standard checks on the woman's licence led to the discovery that it had been cancelled in 2006. Her permit to drive a taxi had run out in 2008, meaning she had been ferrying passengers without either for three years.
The woman owns the taxi business herself and has a total of four cars, according to the report in Aujourd'hui.
The woman could face stiff penalties. Driving without a licence carries a fine of €4,500 ($6,200) and up to two years in prison and illegal driving of a taxi can carry a further year in prison and a fine of €15,000.