There -are- age equivalent tables for both cognitive and achievement tests. We just don't recommend their use. Age equivalents simply mean that this child received the same number of points on this test that the 50th %ile of a certain age group did. They are not considered good descriptors because they don't really tell you if a child could function like that age, if placed at that instructional level, or if she has mastered the same skills.

...pronounced like the long vowel and first letter of the alphabet...