DS2 is 12 years (13 in March) and hasn't yet had his growth spurt. He's around 155 cm and probably about 34 kilos so still a little boy really! He is growing normally but no signs of puberty yet. Just trying to remember when they start growing rapidly. DS1 is 14 and I think it was around now or at some point in year 8 that he starting growing rapidly (he's now 175 cm and still growing). DS2 is getting a bit worried as quite a few of his friends have started growing. Just wondering what the average age is for puberty to start in boys.