Thanks for the knowledge. I was writing in terms of what Biology facilitates. I'm obviously no expert on female reproduction but according to a documentary I watched some years back, genetically speaking, the prime age for women having children is (15-19).There is a higher risk of there being genetic defects in a women's offspring the longer she waits after her teens to have children and a women generally reaches sexual maturity at 16. It's interesting to note that the earliest recorded pregnancy was of Peruvian girl born in 1933 who began menstruating at the age of eight months, and was tragically raped as a 5 year old, giving birth at 6. What is possible from a biological perspective however is not necessarily what is 'safe' or moral.