Notwithstanding my observation about "bling" I've got to say that carbon fiber is cool. Buying my first bike in 20 years and not knowing how long it would stick I wasn't going to buy a more expensive bike than my wife. I'm definitely a recreational rider and haven't done anything seriously aerobic for a long time (does riding a horse qualify?). I haven't tried to find my max. HR yet, but I expect that 156 is getting up there for someone in their 60's, but in the five months I've been cycling I've noticed a big difference in my HR on the same hill.
I agree with the group dynamics being very enjoyable. It will take me a while to figure out group etiquette. I don't like to pass folks, but on hills you really have to go at your own pace according to your gearing and fitness.
'Gonna try again with a 40 miles in 3 weeks. I'll see if I can coax my wife to come along.