The average age of a bridge in the US is about 40-50 years old and the title of the article has "80 years of FEM". https://www.infrastructurereportcard.org/wp-

The average age of a bridge in the US is about 40-50 years old and the title of the article has "80 years of FEM". https://www.infrastructurereportcard.org/wp-content/uploads/2017/01/Bridges-Final.pdf https://www.infrastructurereportcard.org/wp-content/uploads/... I'd posit a large fraction were designed with FEM.