Common Challenges: 'I want children but my husband (or boyfriend doesn't)'

I was recently asked my opinion ion whether there is a best time to have children in ones life - it's for an article in Cosmo UK that should be out in a few months.  But I recently came across this article that is very pro having children when you are in your 20's which is not often an argument I hear.

http://m.psychologytoday.com/blog/resolution-not-conflict/201311/when-is-the-best-time-have-children