Kendrick just celebrated his 20th birthday, which means that:
He can buy tobacco products but not alcohol.
In the US, the legal drinking age is 21, so he cannot purchase alcohol until he turns 21. However, the legal age to buy tobacco products is 21 as well in most states since the federal law raised the minimum age to 21 in 2019. However, there might be exceptions based on specific state laws or prior legislation in some states.