rccardr 

Have a lot of bikes, and at 70 years old there’s only so much that equipment can do to help one keep up with a fast group (‘fast’ being subjective).
All of my racing style steel bikes are fast, relative to other fast steel bikes ridden by moderately competent older guys. Think quality frame tubing, DA or equivalent components, high end tires and wheels, really superlatively tuned, and ridden with, shall we say, casual determination. None heavier than 21 pounds.
Having said that, on fast club rides I reach for the Canyon Endurace. Carbon frame, 105 11 speed, disk brakes, maybe 17 pounds. It does make a difference, cost right at $2K.

Also train thru the winter on a Neo2T six days a week. So, there’s that.