0; build in other methods of exploit detection. If you intend on being somewhat popular then new players will make up a significant portion of your user base.
Good question, I believe you shouldn’t need an age limit… It is very important to not limit player access to your game. But if you were to have an age limit I would say keep it as low as 1/2 days.
How’s your game playability reliant on the person knowing how to use the website? I don’t find it wise to limit access at all, I’ve seen the argument “it stops exploiters” but not that you expect someone to be too inexperienced by their account age