Oldest/youngest child in the school class

Baby #2 due first week of September. My son was 10 days early so its possible i could go early an have an August baby. Everyone keeps telling me it will be better to have the baby in August because of the school years otherwise he will have to wait another year to start school. But just wondering if anyone has children thats the oldest or youngest in the class and how you think they cope with that. I know people who have kids in August who feel they are behind compared to the other kids and people to who September babies who feel their kids are bored being around the little ones. A year between kids at that age is quite a big difference. Any advice?