Yes, you can play blackjack at 18 in some places where the legal gambling age is 18. However, in many locations, the legal age to gamble, including playing blackjack, is 21. It is important to check the specific laws and regulations of the jurisdiction you are in to determine the minimum age for playing blackjack. Some casinos and online gambling sites may have their own age restrictions, so always verify before playing. Remember to gamble responsibly and within the legal age limits to avoid any potential legal consequences.