[Irene Adler]

Girls are maturing at younger and younger ages, nowadays. It's not unknown for girls to start menstruating at the age of 9. I don't know the physiological reason for this, but it sure puts a lot of really young girls at risk of pregnancy.

[IronJack]

How ironic. In an age in which we're encouraged to live a perpetual childhood, we actually mature earlier than ever before.