Since I'm 43 now and not 40, I'm not allowed to have any existential crises over my age. You can visit Dodger Thoughts for that in late November.
But if you want to go back to what the world was like at the time I was born:
Vietnam was two countries.
Germany was two countries.
Yugoslavia was one country. (It is now seven separate countries)
The Soviet Union was made up of what is now fifteen separate countries.
As far as the U.S. was concerned, China was a large unnamed land mass off the coast of Taiwan.
Branch Rickey had been dead for one day.
There had never been a heart transplant in humans.
Babe Ruth was the career home run leader with 714, but the all time NL leader was Mel Ott with 511.
My mother had no idea what the sex of her baby was going to be and the doctors had no sure way of finding out either until I was born.
Barack Obama was four years old.
"Hogan's Heroes" had been on the air for just four months (and an episode was on while I was being born). "Gilligan's Island" was in its second season. "The Brady Bunch" would not go on the air for four more years.
There had been only four James Bond films.
The following people had not yet been inducted into the Baseball Hall of Fame: Ted Williams, Stan Musial, Casey Stengel, and Roy Campanella.
The NFL had just 12 teams. The AFL had 8 teams. The NHL had 6 teams. The NBA had 9 teams. The AL and NL had 10 teams each.
Warren Spahn, Satchel Paige, and Yogi Berra were still active in the 1965 season.
Tim Berners-Lee, Steve Jobs, and Bill Gates were all 10.
The phone company gave you your phone. And you liked it.
You pretty much just could watch what the three big networks and the small syndicated stations showed you. And you better be home when the show you wanted to watch was on. And there were lots of commercials for cigarettes.
Japanese cars were considered to be of inferior quality to American ones.
And as the comments say, this was the #1 song when I was born: