its experience and age matters the most..When they did study did they taken into account age factor? if elder sibling is 3/4 years elder than younger then IQ must be higher as he has more knowledge, more exposure and all..
My observation is, if you compare 10 year old child and 5 year old child then sometimes, younger one is more sharp..(this we always observe around us and we call it as next generation is really very smart..what we came to know at the age of 10 now this new generation talks about it at the age of 7/8 or something like that).. isnt it? ---- this is again due to more exposure for yougener generation than older ones..
After all comparing these figures 101 and 103 is i think useless...!!
