“The first wave of popularity of the skateboard might have been in the 1950s and 1960s “
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As a child of the 50s, born in 1944, I can not remember EVER seeing a skateboard. We did, however, have roller-skates.
I do not remember when I first saw, or heard of a skateboard.
I never saw or heard of them at university in the 60s.
Back then, the board was wood and the wheels were metal. I tried it once on our bumpy tarred road, and that was enough. The vibrations were brutal. I would have loved the modern kind, though.