Why not? Inexperienced people are the casino's advantage. Why on earth casinos will prohibit people who gamble for the first time? And where do you want these people to gain their experience for the first time doing gambling games? I don't think the question made so much sense to me. 
I have been gambling before, but none of these casinos have asked me If I have experience to enter their premise. And If let's say their are casinos who will asks you this, then what's your proof though? Lol.