The Maryland Senate unanimously approved a measure to put a constitutional amendment to voters that would further cement recent court rulings that 17-year-olds may vote in nonpartisan primary elections, as long as they will turn 18 before a general election.

While the matter has been settled in the courts, with a ruling this month from Maryland’s highest court, proponents of a constitutional amendment said the measure, if approved, would codify that policy. Voters would cast ballots on the constitutional change in November. The House of Delegates has not yet acted on a similar measure.

Sen. Roy P. Dyson, a Southern Maryland Democrat, said proposed constitutional amendments might turn out to be the big draw at polling places this fall, even with the hotly contested presidential election. In addition to the 17-year-old amendment, voters will decide on amendments that would legalize slot machine gambling in the state and that would give Marylanders extra days to vote at a limited number of polling places in each county.