18 or 21 is the legal gambling age. For BetMGM, Caesars by William Hill, and FanDuel, you need to be 21 years or older to bet at a Washington, D.C. sportsbook. However, the state-run GambetDC offers sports betting to anyone 18 and up.
In terms of in-person betting at a retail sportsbook, you need to be at least 21. For example, if you bet at Capital One Arena, you’ll be asked for an ID — the same as if you were purchasing alcohol.