Always follow the manufacturer's guidelines for age appropriateness as shown on the product's official packaging. (geekwrapped.com)
Of course you will seek your own comfort level but I really don't think it's time for you to take any rules about age appropriateness too seriously. (fashiononthe4thfloor.com)
Free lessons, games, and lesson plans that are specifically designed for age appropriateness as well as conceptual understanding are ready for you to sample. (dreambox.com)