how while surfing online one brings another

well i was on news page reading headlines when i cam across this one showed a 6ft9 tall woman trying to get the title for the tallest model and tallest legs of the world too.so surfing a little arround this thing i discovered that there are thousands maybe hundreds of thousands of women at that height arround the world and thousands of pages dedicated to tall women .
i can say i am pretty amazed of how many women in the world are in the height of a doorframe and taller.
is it nutricion?
is it our dna evolves?
dont know but from what im seeing i think women will be much taller than they used to be in the next years.