Three months ago, I got back into cycling after a hiatus of close 10 years. Instead of riding my old road bike, I went out and purchased a Giant OCR Composite 3. The bike rides beautifully. Carbon is so much easier on my 59 year old body than any of the aluminum bikes or my old steel frame (Columbus SL/Dura Ace) road bike. My trade off was componentry. The OCR C3 has Shimano 105, SRAM Truvativ, and some no name components on it. I know that this is low/middle level componentry which may be a little heavier than the higher level components - but it all works just fine.
Last week I was surfing ebay and found some very attractive pricing on Dura Ace components. I ordered a new rear derailleur, cassette, crankset and bottom brackets. All 9 speed (as is my current componentry) but priced way below the online dealers and my LBSs discount prices. But - it is Dura Ace.
As a senior citizen, I guess it is OK to do stuff like this. I guess that a new wheelset to replace the old XERO XSR3s is next in line.
In the meantime, I am very much looking forward to riding my new Dura Ace bike. I hope that I notice some difference.