You must be 21 to enter a casino, gamble or purchase or consume Alcoholic Beverages in Las Vegas. If you look young carry a state-issued ID with photograph such as a driver’s license. Children are permitted in the Casino (https://dentalshop.mk/eth-casino-ethereum-payments-games-canada/) public walkways but are not allowed to be near slot machines or gaming tables. You are allowed to carry open alcoholic beverage containers on the street, but not in a vehicle.
So NO you can’t gamble in ANY casinos in Nevada if you are under 21, it’s according to gambling laws in Nevada.