Ok. I’m 72.
Chemistry sets!
Erector sets!
Making gunpowder!
Water rockets!
Estes rockets!
Banana bikes!
Minibikes!
Hula hoops, frisbees (plastics!)
BB Guns!
Cap guns (fanner 50)!
Heathkit radio, stereo!
REAL science fiction (Asimov, Heinlein, Dick, Niven, etc)!
To name a few... ;)
Shortwave Radio, listening to those “forbidden” Communist stations, like Radio Moscow.
Rooting against the Commies in the Olympic Games.