100% on this. In my life I have 0 regrets except not having kids younger. I was never especially fond of kids, but it turns I out love my own more than I imagined possible, and have more fun with them I ever thought I would! I only wish we could have many more but given when we started, the odds of having more than 2 are very low. The amount of joy and life they bring to you and to your house is something you can't really appreciate until you've had them. To say nothing of the sort of fulfillment and life satisfaction they bring.

My parent's goal was to get me to go to college. My goal for my kids is to teach them the importance of having kids early. The fact it might help in having a grandkid or two before I kick the bucket is just a wee bit of icing on that cake. I think the ideal time to start is probably in your 20s. This also maximizes the amount of time you'll get to spend with your kids. I'm quite 'jealous' (sans the negative connotations) of those who will get to see their kids live til retirement, but hey - they made wiser decisions, so hopefully I can help encourage my children to do the same.