Now you are catching on.
The total US fertility rate is less than replacement levels of 2.1 (as of 2011 it is about 1.89). You have women too busy working to have children, women have unlimited abortion, pets have become substitute children, plus having women in the military doesn’t help matters.
Unless you are a very old man who has been saying this since your youth, You are the one catching on, I never had to learn what I have always known.