10.5 puberty to 12 average average
its reactivated because in intra uterine life it was active somewhat but supressed and then gone in early age
ireegularly first few years thats why irregular cycles and sometimes dysmenoeereha and menorrhagia
thats why girls grow taller at first
and then stops growing later on as oestrogen
closes the epiphysis
buy boys keep growing
and grow fast later with increased androgen
and andorgen closes epiphysis for them
earlier the puberty the faster they grow at first but shorter their overall height
tanner staging from stage 1 to 5