Dark elements that may induce nightmares in smaller childrens are usually the reason.
Well I watched terror movies at 5-8 years old without any real issue. For me they were always more comical
duduspace11 "Well, since we are estimating costs, Pokemon Red/Blue did cost Nintendo about $50m to make back in 1996"
Mr Puggsly: "Hehe, I said good profit. You said big profit. Frankly, not losing money is what I meant by good. Don't get hung up on semantics"