I'm 29, and DH is 34, and we're starting to talk seriously now about starting a family soon. I must admit, I do still feel very young for it, though! I reckon in the next year or two.
"Leaving it until 30s"?!?! That's hardly "leaving it", surely? Most people have their families in their 30s or so. There's no way I'd have felt ready before now.
I reckon for a lot of us for whom the right man did turn up relatively early (DH and I have been together since I was 18, he was 23), we likely have a list of practicalities to sort out first.
One of my cousins CHOSE to try for children at 19/20 with his now fiancée. I must admit that I find that very young and "rushing it", as opposed to leaving it. What's the hurry for?? Biologically, it may be a great time to start having children, but our society is hardly geared up for that much anymore, with education now compulsory until 18. He's now 25, they've two small children, and struggling financially as neither have had a stable job since they started their family.
I'd far rather be 29 and thinking of starting a family, than 19 and doing the same.