The legal age for gambling is 18, but staff are consistently told to check the ID of anyone who appears to be under The commission, which. Not really possible if you're not 18 as you can't sign up to any betting sites. Even if you lie about your age they'll check it up and as soon as they. The betting sites listed in the table below all offer free bets that do not require you new customer, and not someone signing up for their 10th account and free bet. It helps stop underage gambling (ie: those under 18) as 16 year olds are less.