I’m not sure I can agree with this.
Children search for everything, and don’t forget that, at least legally in most countries, a child can also be 15 year old.
I’m not familiar with the legality of it, and I haven’t seen OP’s game to see how adult the graphics are, but I would suggest to lean on the safe side. If you think your game might be seen as adult-only, it would be safer to mark it as such.