What are the cons of NOT having kids?

̶L̶e̶s̶s̶ ̶c̶h̶a̶n̶c̶e̶ ̶o̶f̶ ̶d̶e̶v̶e̶l̶o̶p̶i̶n̶g̶ ̶i̶n̶c̶o̶n̶t̶i̶n̶e̶n̶c̶e̶,̶ ̶u̶t̶e̶r̶i̶n̶e̶ ̶p̶r̶o̶l̶a̶p̶s̶e̶ ̶a̶n̶d̶ ̶s̶t̶u̶f̶f̶ ̶l̶i̶k̶e̶ ̶t̶h̶a̶t̶?̶