I did this strategy and the kids basically were fighting for the first 4 years. With a third child, they actually learned to play together. Our situation seems

I did this strategy and the kids basically were fighting for the first 4 years. With a third child, they actually learned to play together. Our situation seems to be a little rare though. Most other kids seem to play together well (including me and my sister). It's just our oldest two having incompatible personalities. But if you can afford it, I'd still recommend getting most of the kids at a younger age. Besides the biological/medical issues of having kids at an older age, you'll also have more time for yourself in your 40s.