I have the heart rate of a 23 year old!!
I hit a new max HR today ... 197 bpm. That surprised me because my previous high of 194 bpm is already quite a bit over that 220-age thing.
I felt a little fuzzy and my hands went numb, but other than that, I didn't really feel like I was working all that hard. However, on the next two attempts I only reached 195 bpm.
What's your max, and does it fit with that 200-age estimate?