New York’s top judge is calling on the state to break with a long-held practice of trying all 16- and 17-year olds as adults and instead to seek ways to rehabilitate them. Judge Jonathan Lippman, the chief of the state court of appeals, wants 16- and 17-year-olds accused of less serious crimes to be transferred to family courts. It is a move that would require a reorganization of the state’s juvenile justice system and would have to be approved by Gov. Andrew Cuomo, a Democrat, and the state Legislature. While the state Assembly is controlled by Democrats, the Senate is majority Republican. Democratic lawmakers in New York have been generally supportive of reforming the measure in the past, while Republicans have for the most part opposed it.