My son is 5 (pre-k). We thought about early entry to kinder last fall... and realized although mentally more than capable.. maturity wise he is no where ready. I wonder if he was with kids that are at his intellectual age would his emotional age increase. We have not had him tested (its not financially feasible) but he completes my 1st graders enrichment math and reads at about an beginning 1st grader.

So to answer your question... yes it is very possible

hth
Sheila