lol does he have to mention his own 'large' <cough cough> penis on everything he posts on?! In which case im going to mention my bra size on every post instead of just on the thread it was relevant too ( 32DD ) ( . ) ( . ) thank you
Anyway back onto the subject, Metal Punk Guy, try not to worry there really isnt an average size because everyone is different and you have plenty of time to grow and mature. I was a late developer (all my mates had boobs and stuff at age 13 and i didnt get mine till i was 16) which was embarressing at the time but it doesnt matter now
The only time you should start worrying is in a few years time when you can go to your doctor for a chat and they can easily see whats going on for you. Its not serious so dont worry about it, like you said your brother had a sudden spurt, so give it a while and see

best wishes xxx