A client of mine had hers young - just as she was starting university, and her husband was going through medical school. By the time she was at work a few years later in HR at a company, the others were going on maternity leave, and she rose through the ranks and by thirty, was heading up the HR at a large company. Worked out well for them and they now feel that they are very free, with older children, decent work, and a lot of time on their hands when they want it.
And I don't get it - why? Does it truly bring 'happiness'?
Not when doing it that way I think!
I am definitely swayed to the "having kids' earlier, especially having done it and having this story to affirm it. As you know we are on a year long adventure right now - early 50s, no kids. It's awesome!
My son is 27 with a nearly two year old and his wife is finishing a politics degree and working in policy for super company. It's actually a good way to stay grounded and focused ... You have the energy for a career AND a kid.