Hi girls

I have a little boy who turns 3 in December (cant quite believe it) and alot of his little friends are going to preschool next year at 3??

I had always planned to send him at 4
to be ready for school... But wondering if he will be at a disadvantage, will those kids be ahead of him? I work part time so he spends 2 days a week with grandparents and I spend time doing activities as well as attending playgroup once a week so he can socialise.....
I just feel they spend so much of their life at school why rush it
But wondering what others have found when making this choice??