Be Fruitful and Multiply

I got a phone call from my brother the other day giving me some not-so-surprising news. "My wife's pregnant" he says. For alot of ppl this might be sort of a shock, but not for. No not considering that 3 other siblings have children on the way. This might not seem like such a big deal when you consider the size of my family. See I have 11 brothers and sisters and an extended family of around 23.
Of my immidiate family I'm the oldest child who's never been married...and I just turned 17. Is that normal? Considering the next oldest is only 2 years my senior? I can count on one hand those of my extended family (the one which tips the scales at 23 members) who are older than me and not married or having a child.
Weddings have turned into annual events for my family. I guess it's just werid considering there were very few nephews and neices in my family for several years, and the all of a sudden 3 this year, and at least 4 next year and the times not even up, there could be more comin along...who knows.