Logically, the most gifted and smartest kid will advance faster, and be placed in higher levels, resulting in them usually being the youngest in the class.
For example, if your school told you your 5 year old is smart enough to start 1st grade, you'll likely enroll it into 1st grade, making it younger than the average 6 year old 1st grader.
Unfortunately this has the problem of straining the kid, and rather than seeming and being exceptional, it'll appear average. Later on in life when grades, extracurriculars, become important for college admissions, the kid will be disadvantaged because of this, since age is usually never considered.
Moral of the story: it's better to be a big fish in a small pond.
For example, if your school told you your 5 year old is smart enough to start 1st grade, you'll likely enroll it into 1st grade, making it younger than the average 6 year old 1st grader.
Unfortunately this has the problem of straining the kid, and rather than seeming and being exceptional, it'll appear average. Later on in life when grades, extracurriculars, become important for college admissions, the kid will be disadvantaged because of this, since age is usually never considered.
Moral of the story: it's better to be a big fish in a small pond.