We talked Mr W into Prek with 4/5 year olds when he was 3.5 as he blew through his Montessori Primary class in about 4 months.
His areas of asynchrony were his handwriting/coloring and emotional reaction when he did not get his way.
The handwriting soon was on par with his classmates, his art is phenomenal, and his emotional intensity is still a challenge, but getting better.
Bobbie's comment about friendly competition is true. Mr W has to emulate the best of his class peers and it keeps him on his toes.
