This is our story. Beautiful early March ds2. Socially very very ready. A dream personality. Very compliant, agreeable. Everyone said he was ready. We knew he was ready. Socially and academically. we started him in nsw aged 4 turning 5. He was just the best boy in class! But as kindy and yr 1 went on, his teachers expressed that he was not completing tasks on time and had some motor skill delays. OT was helpful. We recently moved and opted for ds2 to do yr 2 again at the new school. No social prejudice from peers. He has thrived and has new confidence. Looking back with the benefit of hindsight, i would not start a child age 4. My dd will have to wait for the extra year. If you are in two minds, that is the decision. Wait til 5 . Just my experience. All the best.