True that - my sister had a friend who was 21 and already expecting her second child - and we were both like... holy shit.
My dad is 30 years older than me and everyone i met at Law school were like - Oh, your parents are really young.
I can say that at least here, its uncommon to get kids before late 20s but it happens. They obviously made a television program about those dimwits who get kids at 16 and its painfully obvious that they arent the brightest.