why would anyone want to spend those late years doing the school run and bringing up toddlers into their late thirties/forties. It's not for me and I don't agree with it
Because I've travelled the world, had a fantastic education, sown my wild oats, calmed down and wised up and met a lovely bloke who makes a brilliant dad. I respect your decision that it isn't for you... but why on earth do you think you have a right to "not agree with it"? If a parent is a good one, then great. If they aren't, ouch. Age doesn't determine that.
I disagree with people having kids who aren't fit to parent, or who fail to do so. Otherwise, it's none of my damn business, is it? Perhaps that's maturity speaking, though. 