I had my first child when I was 23 (3 years after I got married), and had 4 children by the time I was 27. At times when I am paying my childcare bill I wish I had studied first but in fact I would never have found this career if I hadn't procreated first, so no, I don't wish I had waited. Apart from anything else I was so intensely broody in my early 20's that it would have been painful to try and suppress that. Now I am in my 30's and just as restricted in my social life as those of my friends who had kids in their 30's, but I know in 10 years I will have my social life back again whilst I'll still be young enough to enjoy it