I just found out that the Wham-o company first marketed their legendary hoops in 1958. "Wham-O has become the most successful manufacturer of hula hoops in modern times. They trademarked the name Hula Hoop ® and start manufacturing the toy out of the new plastic Marlex in 1958".
Guess what else happened in 1958? I was born. Wow, that's a weird bit of synchronicity isn't it?