How Old Do You Have to Be to Use Kalshi

The answer is 18. That single number sits at the center of a much bigger fight right now, one involving federal lawmakers, state attorneys general, and two major sports leagues. Understanding why the age line is set where it is, and how long it might stay there, matters more than the number itself.

The Federal Standard: 18, Not 21

Kalshi requires users to be at least 18 years old and a verified US resident before they can open an account or trade a single event contract. That threshold comes from Kalshi's status as a CFTC-regulated exchange, not a gambling operator. The Commodity Futures Trading Commission approved Kalshi as a Designated Contract Market back in 2020, which places it in the same regulatory category as commodities and derivatives exchanges. Those markets have long used 18, the general age of majority, as the entry point for financial trading. Compare that to sportsbooks, which almost universally set the bar at 21 under state gaming law, and the gap becomes the whole story.

Kalshi CEO Tarek Mansour has defended that distinction directly. He has argued that prediction market trading should be treated the same as equities trading rather than gambling, which is precisely why the company has resisted pressure to raise its minimum age.

Verification Isn't Optional

Signing up requires more than checking a birthdate box. Kalshi runs a Know Your Customer process, the same identity-verification standard used by regulated brokerages, and it checks submitted information against government records before an account goes live. New traders need a valid driver's license, passport, or state ID, and the details on that document have to match what's entered during signup. Mismatches cause delays. Kalshi has also started requiring selfie verification for accounts flagged as higher risk, on top of standard document checks.

Not Every State Draws the Line at 18

The federal floor is 18, but a handful of states push it higher. Mississippi requires traders to meet the state's own age of majority, which is 21, and Kalshi enforces that state-specific rule for residents there rather than defaulting to its national minimum. It's a reminder that "the Kalshi age requirement" isn't a single fixed answer nationwide. Users should check eligibility at signup rather than assume the 18-year floor applies everywhere.

State-level scrutiny goes well beyond age minimums, too. Massachusetts sued Kalshi over unlicensed sports betting last September, and in June 2026 the state's attorney general moved to expand that lawsuit specifically to include claims that Kalshi let users younger than 21 place sports-related trades, plus claims that self-excluded gamblers were still able to access the platform. That case is still active, and it's the clearest example yet of a state trying to import its 21-and-over sportsbook standard directly into prediction market regulation.

Where Kalshi Doesn't Operate at All

Age eligibility is moot if the platform isn't available where you live. As of August 2026, Kalshi is restricted or unavailable in Arizona, Massachusetts, Maryland, Michigan, Montana, New Jersey, and Ohio, and it has faced court challenges in Nevada as well, though federal rulings have so far let it keep operating there while litigation continues.

A 2026 Third Circuit appellate decision and a Tennessee federal injunction have both shaped this patchwork further, and roughly seven states remain actively contested between state gaming regulators and the CFTC's federal framework. The practical effect: a resident of a restricted state can be 25 years old with a verified ID and still not be able to open an account, because the fight in those states isn't about age at all. It's about whether Kalshi needs a state gambling license in the first place.

New Safeguards, Same Age Floor

Pressure on the minimum age intensified sharply in May 2026. Senators Kirsten Gillibrand and Dave McCormick introduced the Prediction Market Act of 2026, bipartisan legislation that would mandate age verification and self-exclusion programs across the industry. Days later, the NBA and PGA Tour publicly called on prediction markets to raise their trading age to 21, matching the standard used by American sportsbooks. NBA executive Dan Spillane told the CFTC directly that trading in sports event contracts carries financial risks that may be particularly acute for younger traders.

Kalshi responded within days, not by raising its age minimum but by tightening everything around it. Face ID became the default login method across the app, aimed squarely at stopping minors from using a parent's or older sibling's account to get around KYC checks. The company also rolled out a feature called Inner Circle, which lets users share their trading activity with friends or family for accountability, along with usage-based deposit limit recommendations and proactive monitoring for signs of unhealthy trading patterns. Kalshi has said minors will still be able to view market data and follow the news, just not place trades.

Notably, Mansour held firm on 18 as the right number even while adding all of that. He has continued arguing that trading in sports event contracts should not be classified as gambling in the first place, since users are trading peer-to-peer rather than betting against the house. That framing is the crux of nearly every legal fight Kalshi is currently in.

The Underlying Problem the Age Debate Reveals

None of this happened in a vacuum. A Common Sense Media survey published in January 2026 found that a striking share of boys aged 11 to 17, more than a third, reported gambling in some form over the previous year, spanning sportsbooks, prediction markets, and online casino products. That data point is doing a lot of work in Washington right now, and it's the real reason lawmakers moved as fast as they did on the Prediction Market Act.

The age requirement itself isn't complicated. Eighteen, government ID, KYC verification, and in a small number of states a higher bar. What's unsettled is whether that number holds. Kalshi is fighting a two-front war right now, one over whether it needs state gambling licenses at all, and a separate one over whether 18 is even the right age for this kind of trading regardless of how it's classified. The safeguards rolled out in May address the first concern lawmakers actually care about, which is enforcement of the existing rule, not necessarily the age itself. Whether that's enough to keep the number at 18 rather than 21 is likely to be decided in court and in Congress well before it's decided by Kalshi.