This is right. The discovery of antibiotics and many other medical advances somehow influenced this, too, though.

General social welfare (housing, food, public health), basic sanitation, food and water quality regulation, and a few very early vaccines had far more to do with this.

Antibiotics weren't widespread until after WWII, as were most of the vaccines we currently consider standard.

Medicine as a whole is an astounding example of diminishing returns to innovation.