69 years old here! I have a couple of folders - Dahon, Tern & Giant. The past June, I was riding my Giant Expressway One, 406 wheels, down a slight downhill grade at a good clip - 20+, when I t-boned a medium sized dog. I went straight over the bars and landed directly on my head. Very minor abrasions as the head took most of the blow. I cracked my SMITH Mips helmet and sustained a moderate concussion. Dog and bike came out OK.
Takeaways:
- Just because you are on a small bike doesn't mean you can't wreck big
- Small wheeled bikes are twitchy at higher speeds
- Rider has a high center of gravity on a small bike
- A relatively small obstacle can cause over the bars flip
I posted a more detailed account of my crash, with photos of my helmet, earlier. One piece of advice I got was that 20mph is too fast on a small wheeled bike! Heck, I go 35 on some downhills!