I grew up on the southeast side of Portland. When I was 10, I rode my bike to Multnomah Falls and across the river into Washington State. I moved away just before my 11th birthday so I’m very confident about my age. I also rode all around Portland. Into downtown, down to Lake Oswego, over to my aunt’s in Gresham…
The worst thing that ever happened was an older kid on a bike came up next to me and tried to push me off of my bike, but it didn’t work and I took off and he was chasing me. I wove thru traffic and parked cars at a shopping center and he ended up slamming into a parked car at full speed. :)