All good stuff above, I'm 64 and have seen 178 on a few sprints when I started way too early! I've also rode at 160 for very long times. I love my HR monitor, eventually you get go know your BPM so well (especially when looked at in conjunction with wattage generated) that it becomes invaluable in self analysis. In spite of my obsession (and many others) with gadgets and personal numbers, there are plenty of folks who enjoy cycling just as much WITHOUT all this 21st century information!