Most US states set the minimum age for sports betting — including over under wagers — at 21. A smaller number of states permit wagering at 18. The rules are set at the state level, not federally, so the threshold varies depending on where you are physically located when you place a bet. Illinois, for example, explicitly requires bettors to be 21+. Always verify the age requirement with your state's gaming regulator before signing up. 21+. Gambling problem? Call 1-800-GAMBLER.
Why do most states require 21 instead of 18?
Most states tied their sports-betting age floor to their existing casino gambling age, which is 21 across the majority of jurisdictions. When state legislatures drafted sports-betting bills post-PASPA, they largely carried that threshold over. The result: 21 is the clear majority rule in the US market.
A handful of states do allow 18+ wagering, typically where no casino gaming infrastructure existed before and the legislature set a lower bar. That group remains small. The research for Where Is Over Under Betting Legal? State-by-State Status in 2026 covers which states are fully operational and which are still pending.
Which states have notable age or access rules worth knowing?
- Illinois: 21+ minimum. Up to 26 operator licenses active.
- Missouri: Launched online sportsbooks in December 2025 under Amendment 2. Age rules follow the standard 21+ framework adopted at launch.
- Vermont: Launched online sports betting January 11, 2024 with three operators.
- Florida: Mobile sports betting is restricted to Hard Rock Bet under the Seminole tribal compact, upheld in 2025. Bettors must meet the platform's minimum age requirement.
- New Mexico, North Dakota, Washington, Wisconsin: Some tribes in these states offer sports betting under existing Class III gaming compacts without separate state legislation. Age rules are governed by tribal ordinance and compact terms, which may differ from state-licensed sportsbooks elsewhere.
What about states where betting is still illegal?
Age requirements are irrelevant if no legal market exists. States including Texas, Utah, Idaho, Hawaii, Alaska, Alabama, Georgia, Minnesota, South Carolina, and Oklahoma have no legal sports betting as of 2025–2026. California rejected online sports betting when Prop 26 and Prop 27 both failed in November 2022. If you are in one of these states, no licensed over under bet option is available regardless of your age. See States Where Over Under Betting Remains Illegal in 2026 for the full list.
Does the minimum age differ by betting channel?
In states like Mississippi, app-based wagering is only permitted on-site at licensed casinos, meaning physical presence at a licensed venue is required on top of meeting the minimum age. Montana similarly restricts wagering to lottery terminals and a state-authorized app in approved locations only. Online-only states without location restrictions are the simpler case: meet the age floor and you can bet from anywhere within state lines.
| State | Minimum Age | Notable Restriction |
|---|---|---|
| Illinois | 21+ | Up to 26 licenses active |
| Missouri | 21+ | Launched December 2025 |
| Vermont | 21+ | Three operators since Jan 2024 |
| Florida | 21+ | Hard Rock Bet only (Seminole compact) |
| Mississippi | 21+ | On-site at licensed casino only |
| Montana | 18+ (lottery-based) | Lottery terminals and approved locations only |
Where can I find the full legal and tax picture?
Age requirements are just the entry point. Once you clear that bar, tax obligations follow immediately. All gambling winnings are federally taxable income. For a full breakdown of W-2G thresholds and withholding rules, see Taxes on Over Under Winnings: W-2G Thresholds and Federal Rules for 2026. For the broader regulatory framework covering licensing, state laws, and operator requirements, start with Legal Over Under Betting in the US: State Laws and Tax Rules.
State rules change. A state caveat applies throughout: legality, minimum age, and available operators all depend on your jurisdiction at the time you place a bet. Check your state gaming commission's official site for current requirements before depositing.