There are currently twelve states that have established 18+ over as their legal minimum gambling age for state-regulated casino gaming.
The DOJ even stated online poker was not illegal unless you owned the poker site. “Illegal gambling” is now defined as sports betting online, therefore, it’s legal to play poker and casino games if your state allows – four (4) states currently (DE, NJ, NV, PA) and according to the DOJ, online poker is legal to play in ANY state. Poker News & Discussion News, Views, and Gossip Poker Goals & Challenges Poker Beats, Brags, and Variance That's What She Said! Poker Legislation Twitch Online Poker Televised Poker General Poker Strategy Beginners Questions Books and Publications Poker Tells/Behavior Poker.
Right now there are four states that offer legal and regulated online poker - Delaware, Nevada, New Jersey, and Pennsylvania.