Alvin Hellerstein, a 92-year-old American judge with a long list of high-profile cases, is overseeing the legal proceedings against Venezuela's ousted president, Nicolas Maduro.

Concerns are being raised about the suitability of 92-year-old U.S. federal judge Alvin Hellerstein to preside over what could be a prolonged drug trafficking trial for Nicolas Maduro.

Alvin Hellerstein, the 92-year-old US judge handling the case against deposed Venezuelan leader Nicolas Maduro, has presided over a number of notable trials during his decades on the bench.