Meet Levi. Levi is seven years old and is being interviewed by his sister, Maris Rae. You can learn more about Levi on his Facebook page www.facebook.com/littleLevi! February 28 is rare disease day. Levi has Jansen’s Metaphyseal Chondrodysplasia. He is one of 20 cases ever documented WORLDWIDE. We all have so much to learn from him, his personality and courage, that is.