I don’t recall scooters being popular in my neighborhood when I was a kid.  My friends and I were more into bikes and roller skates … the old fashioned skates that fit over your shoes and had a key!  I always had boo boos on my knees from falling when learning to roller skate on the bumpy sidewalks!  Today I often see kids tooling around on scooters.  They look like fun and there are probably no training wheels required!  🙂