Saying he would mete out a longer sentence if he could, U.S. District Court Judge Alan Gold handed down the strictest prison sentence possible under federal guidelines — 15 years — for one-time high-flying Miami attorney Louis S. Robles for bilking elderly clients out of more than $13 million.

Gold had previously rejected a plea deal worked out for Robles by the U.S. Attorney’s office that would have resulted in 10 years behind bars for the 59-year-old lawyer, saying it was too lenient.