I recommend this game to anyone of any age.  Although it has some nudity / blood, I think it's tame enough and reminiscent of the original era that it's more education than anything for youngsters under 10.  The music is probably one of the major perks.  I've downloaded and listened to the music on MP3 players driving around because it's THAT good.  The gameplay is simple as can be:  sidescroller, jump, attack, item, and magic.  There are literally hundreds of weapons, armor, etc items to find, it's amazing what some of the more rare special weaps do.  The game itself is pretty long too, once you beat it, you beat it again upside down and all monsters/music/items are changed to reflect your stronger levels.