The legal age for gambling in Mississippi in a land based casino is 21.
The legal age for gambling in Mississippi in an online casino is 18.
The legal age for gambling in Mississippi for Charity Bingo & Pull-tabs is 18.
The Mississippi state law for gambling an a land based casino is 21, there is currently no state law in Mississippi for online gambling, so it reverts to the federal law making the minium age 18. This can be due to the fact that land based casinos sell alcohol and you must be 21+ to drink.