defining an age?

i guess i had not picked up on the fact that it's a concrete structure---makes it all the more amazing

From a technological standpoint, it’s profoundly impressive that a reinforced concrete frame has outperformed the steel of Taipei 101 — the previous record holder for height — by 1,050 feet. This achievement suggests a new era in structural engineering: the compressive strength of concrete has tripled in the last four decades, allowing concrete structures to be thinner, lighter and far, far taller.