I remember my Mom telling me my little brother had to ride in the back seat because he was a toddler (which would make me 5-ish), but that I was big enough to stay in my seat (in the front) and not let myself flop forward into the dashboard or windshield, if we had a car accident.
From approximately ages 2-6, my Dad drove an orange VW camper-van ("The Great Pumpkin"). My place, which he called the "(VocalMinority)-seat", was a tall, 3-leg, round-seat stool placed slightly behind the two front seats - and between them, of course, so I could see! Nothing between me and the windshield! And the stool wasn't attached to the floor or anything. (Wouldn't that be inconvenient, when you wanted to camp and move seats around?)
We spent summers at my grandmother's 3rd-floor condo at the beach. It was a late-60's/early-70's design, with a random super-narrow, floor-to-ceiling recessed window in the master bedroom. Predictably, that was every little kid's favorite place to hide, in hide-and-seek. Only a little kid could wedge themselves in there, behind the shade. When I was 3, I was very verbal and my poor mother thought it would be safe to open that window for some fresh air, leaving just the screen down, and reason with me that it wasn't safe to play there. Later, she went looking for me and found me lying in the parking lot, below the window, with a fractured skull! Thankfully - for all involved - I came out of it just fine.

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