I'm 39 and childless, and intend to remain so. I do notice "sir" and "ma'am" are gone. People I buy things from like to pal around a bit too much for my liking. Also, certain tenets of fashion I just don't understand, such as flat-brimmed caps, especially on a white guy.
"For me, it is far better to grasp the Universe as it really is than to persist in delusion, however satisfying and reassuring." - Carl Sagan